TSHARK(1) TSHARK(1)

NAME

tshark - Dump and analyze network traffic

SYNOPSIS

tshark [ -i <capture interface>|- ] [ -f <capture filter> ] [ -2 ]
[ -r <infile> ] [ -w <outfile>|- ] [ options ] [ <filter> ]

tshark -G [ <report type> ] [ --elastic-mapping-filter <protocols> ]

DESCRIPTION

TShark is a network protocol analyzer. It lets you capture packet
data from a live network, or read packets from a previously saved
capture file, either printing a decoded form of those packets to the
standard output or writing the packets to a file. TShark's native
capture file format is pcapng format, which is also the format used
by Wireshark and various other tools.

Without any options set, TShark will work much like tcpdump. It will
use the pcap library to capture traffic from the first available
network interface and displays a summary line on the standard output
for each received packet.

When run with the -r option, specifying a capture file from which to
read, TShark will again work much like tcpdump, reading packets from
the file and displaying a summary line on the standard output for
each packet read. TShark is able to detect, read and write the same
capture files that are supported by Wireshark. The input file
doesn't need a specific filename extension; the file format and an
optional gzip, zstd or lz4 compression will be automatically
detected. Near the beginning of the DESCRIPTION section of
wireshark(1) or
<https://www.wireshark.org/docs/man-pages/wireshark.html> is a
detailed description of the way Wireshark handles this, which is the
same way TShark handles this.

Compressed file support uses (and therefore requires) the zlib
library. If the zlib library is not present when compiling TShark,
it will be possible to compile it, but the resulting program will be
unable to read compressed files.

When displaying packets on the standard output, TShark writes, by
default, a summary line containing the fields specified by the
preferences file (which are also the fields displayed in the packet
list pane in Wireshark), although if it's writing packets as it
captures them, rather than writing packets from a saved capture file,
it won't show the "frame number" field. If the -V option is
specified, it instead writes a view of the details of the packet,
showing all the fields of all protocols in the packet. If the -O
option is specified, it will only show the full details for the
protocols specified, and show only the top-level detail line for all
other protocols. Use the output of "tshark -G protocols" to find the
abbreviations of the protocols you can specify. If the -P option is
specified with either the -V or -O options, both the summary line for
the entire packet and the details will be displayed.

Packet capturing is performed with the pcap library. That library
supports specifying a filter expression; packets that don't match
that filter are discarded. The -f option is used to specify a
capture filter. The syntax of a capture filter is defined by the
pcap library; this syntax is different from the read filter syntax
described below, and the filtering mechanism is limited in its
abilities.

Read filters in TShark, which allow you to select which packets are
to be decoded or written to a file, are very powerful; more fields
are filterable in TShark than in other protocol analyzers, and the
syntax you can use to create your filters is richer. As TShark
progresses, expect more and more protocol fields to be allowed in
read filters. Read filters use the same syntax as display and color
filters in Wireshark; a read filter is specified with the -R option.

Read filters can be specified when capturing or when reading from a
capture file. Note that that capture filters are much more efficient
than read filters, and it may be more difficult for TShark to keep up
with a busy network if a read filter is specified for a live capture,
so you might be more likely to lose packets if you're using a read
filter.

A capture or read filter can either be specified with the -f or -R
option, respectively, in which case the entire filter expression must
be specified as a single argument (which means that if it contains
spaces, it must be quoted), or can be specified with command-line
arguments after the option arguments, in which case all the arguments
after the filter arguments are treated as a filter expression. If
the filter is specified with command-line arguments after the option
arguments, it's a capture filter if a capture is being done (i.e., if
no -r option was specified) and a read filter if a capture file is
being read (i.e., if a -r option was specified).

If the -w option is specified when capturing packets or reading from
a capture file, TShark does not display packets on the standard
output. Instead, it writes the packets to a capture file with the
name specified by the -w option.

If you want to write the decoded form of packets to a file, run
TShark without the -w option, and redirect its standard output to the
file (do not use the -w option).

If you want the packets to be displayed to the standard output and
also saved to a file, specify the -P option in addition to the -w
option to have the summary line displayed, specify the -V option in
addition to the -w option to have the details of the packet
displayed, and specify the -O option, with a list of protocols, to
have the full details of the specified protocols and the top-level
detail line for all other protocols to be displayed. If the -P
option is used together with the -V or -O option, the summary line
will be displayed along with the detail lines.

When writing packets to a file, TShark, by default, writes the file
in pcapng format, and writes all of the packets it sees to the output
file. The -F option can be used to specify the format in which to
write the file. This list of available file formats is displayed by
the -F option without a value. However, you can't specify a file
format for a live capture.

When capturing packets, TShark writes to the standard error an
initial line listing the interfaces from which packets are being
captured and, if packet information isn't being displayed to the
terminal, writes a continuous count of packets captured to the
standard output. If the -q option is specified, neither the
continuous count nor the packet information will be displayed;
instead, at the end of the capture, a count of packets captured will
be displayed. If the -Q option is specified, neither the initial
line, nor the packet information, nor any packet counts will be
displayed. If the -q or -Q option is used, the -P, -V, or -O option
can be used to cause the corresponding output to be displayed even
though other output is suppressed.

When reading packets, the -q and -Q option will suppress the display
of the packet summary or details; this would be used if -z options
are specified in order to display statistics, so that only the
statistics, not the packet information, is displayed.

The -G option is a special mode that simply causes TShark to dump one
of several types of internal glossaries and then exit.

OPTIONS

-2

Perform a two-pass analysis. This causes TShark to buffer output
until the entire first pass is done, but allows it to fill in
fields that require future knowledge, such as 'response in frame
#' fields. Also permits reassembly frame dependencies to be
calculated correctly.

-a|--autostop <capture autostop condition>

Specify a criterion that specifies when TShark is to stop writing
to a capture file. The criterion is of the form test:value,
where test is one of:

duration:value Stop writing to a capture file after value seconds
have elapsed. Floating point values (e.g. 0.5) are allowed.

files:value Stop writing to capture files after value number of
files were written.

filesize:value Stop writing to a capture file after it reaches a
size of value kB. If this option is used together with the -b
option, TShark will stop writing to the current capture file and
switch to the next one if filesize is reached. When reading a
capture file, TShark will stop reading the file after the number
of bytes read exceeds this number (the complete packet will be
read, so more bytes than this number may be read). Note that the
filesize is limited to a maximum value of 2 GiB.

packets:value switch to the next file after it contains value
packets. Same as -c<capture packet count>.

-A <user>:<password>

Specify a user and a password when TShark captures from a
rpcap:// interface where authentication is required.

This option is available with libpcap with enabled remote
support.

-b|--ring-buffer <capture ring buffer option>

Cause TShark to run in "multiple files" mode. In "multiple
files" mode, TShark will write to several capture files. When
the first capture file fills up, TShark will switch writing to
the next file and so on.

The created filenames are based on the filename given with the -w
option, the number of the file and on the creation date and time,
e.g. outfile_00001_20240714120117.pcap,
outfile_00002_20240714120523.pcap, ...

With the files option it's also possible to form a "ring buffer".
This will fill up new files until the number of files specified,
at which point TShark will discard the data in the first file and
start writing to that file and so on. If the files option is not
set, new files filled up until one of the capture stop conditions
match (or until the disk is full).

The criterion is of the form key:value, where key is one of:

duration:value switch to the next file after value seconds have
elapsed, even if the current file is not completely filled up.
Floating point values (e.g. 0.5) are allowed.

files:value begin again with the first file after value number of
files were written (form a ring buffer). This value must be less
than 100000. Caution should be used when using large numbers of
files: some filesystems do not handle many files in a single
directory well. The files criterion requires either duration,
interval or filesize to be specified to control when to go to the
next file. It should be noted that each -b parameter takes
exactly one criterion; to specify two criterion, each must be
preceded by the -b option.

filesize:value switch to the next file after it reaches a size of
value kB. Note that the filesize is limited to a maximum value
of 2 GiB.

interval:value switch to the next file when the time is an exact
multiple of value seconds. For example, use 3600 to switch to a
new file every hour on the hour.

packets:value switch to the next file after it contains value
packets.

nametimenum:value Choose between two save filename templates. If
value is 1, make running file number part before start time part;
this is the original and default behaviour (e.g.
log_00001_20240714164426.pcap). If value is greater than 1, make
start time part before running number part (e.g.
log_20210828164426_00001.pcap). The latter makes alphabetical
sortig order equal to creation time order, and keeps related
multiple file sets in same directory close to each other.

Example: tshark -b filesize:1000 -b files:5 results in a ring
buffer of five files of size one megabyte each.

-B|--buffer-size <capture buffer size>

Set capture buffer size (in MiB, default is 2 MiB). This is used
by the capture driver to buffer packet data until that data can
be written to disk. If you encounter packet drops while
capturing, try to increase this size. Note that, while TShark
attempts to set the buffer size to 2 MiB by default, and can be
told to set it to a larger value, the system or interface on
which you're capturing might silently limit the capture buffer
size to a lower value or raise it to a higher value.

This is available on UNIX systems with libpcap 1.0.0 or later and
on Windows. It is not available on UNIX systems with earlier
versions of libpcap.

This option can occur multiple times. If used before the first
occurrence of the -i option, it sets the default capture buffer
size. If used after an -i option, it sets the capture buffer
size for the interface specified by the last -i option occurring
before this option. If the capture buffer size is not set
specifically, the default capture buffer size is used instead.

-c <capture packet count>

Set the maximum number of packets to read when capturing live
data. Same as -a packets:<capture packet count>. If reading a
capture file, set the maximum number of packets to read.

-C <configuration profile>

Run with the given configuration profile.

-d <layer type>==<selector>,<decode-as protocol>

Like Wireshark's Decode As... feature, this lets you specify how
a layer type should be dissected. If the layer type in question
(for example, tcp.port or udp.port for a TCP or UDP port number)
has the specified selector value, packets should be dissected as
the specified protocol.

Example: tshark -d tcp.port==8888,http will decode any traffic
running over TCP port 8888 as HTTP.

Example: tshark -d tcp.port==8888:3,http will decode any traffic
running over TCP ports 8888, 8889 or 8890 as HTTP.

Example: tshark -d tcp.port==8888-8890,http will decode any
traffic running over TCP ports 8888, 8889 or 8890 as HTTP.

Using an invalid selector or protocol will print out a list of
valid selectors and protocol names, respectively.

Example: tshark -d . is a quick way to get a list of valid
selectors.

Example: tshark -d ethertype==0x0800. is a quick way to get a
list of protocols that can be selected with an ethertype.

-D|--list-interfaces

Print a list of the interfaces on which TShark can capture, and
exit. For each network interface, a number and an interface
name, possibly followed by a text description of the interface,
is printed. The interface name or the number can be supplied to
the -i option to specify an interface on which to capture.

This can be useful on systems that don't have a command to list
them (UNIX systems lacking ifconfig -a or Linux systems lacking
ip link show). The number can be useful on Windows systems, where
the interface name might be a long name or a GUID.

Note that "can capture" means that TShark was able to open that
device to do a live capture. Depending on your system you may
need to run TShark from an account with special privileges (for
example, as root) to be able to capture network traffic. If
tshark -D is not run from such an account, it will not list any
interfaces.

-e <field>

Add a field to the list of fields to display if -T
ek|fields|json|pdml is selected. This option can be used
multiple times on the command line. At least one field must be
provided if the -T fields option is selected. Column names may be
used prefixed with "_ws.col."

Example: tshark -e frame.number -e ip.addr -e udp -e _ws.col.Info

Giving a protocol rather than a single field will print multiple
items of data about the protocol as a single field. Fields are
separated by tab characters by default. -E controls the format
of the printed fields.

-E <field print option>

Set an option controlling the printing of fields when -T fields
is selected.

Options are:

bom=y|n If y, prepend output with the UTF-8 byte order mark
(hexadecimal ef, bb, bf). Defaults to n.

header=y|n If y, print a list of the field names given using -e
as the first line of the output; the field name will be separated
using the same character as the field values. Defaults to n.

separator=/t|/s|<character> Set the separator character to use
for fields. If /t tab will be used (this is the default), if /s,
a single space will be used. Otherwise any character that can be
accepted by the command line as part of the option may be used.

occurrence=f|l|a Select which occurrence to use for fields that
have multiple occurrences. If f the first occurrence will be
used, if l the last occurrence will be used and if a all
occurrences will be used (this is the default).

aggregator=,|/s|<character> Set the aggregator character to use
for fields that have multiple occurrences. If , a comma will be
used (this is the default), if /s, a single space will be used.
Otherwise any character that can be accepted by the command line
as part of the option may be used.

quote=d|s|n Set the quote character to use to surround fields. d
uses double-quotes, s single-quotes, n no quotes (the default).

-f <capture filter>

Set the capture filter expression.

This option can occur multiple times. If used before the first
occurrence of the -i option, it sets the default capture filter
expression. If used after an -i option, it sets the capture
filter expression for the interface specified by the last -i
option occurring before this option. If the capture filter
expression is not set specifically, the default capture filter
expression is used if provided.

Pre-defined capture filter names, as shown in the GUI menu item
Capture->Capture Filters, can be used by prefixing the argument
with "predef:". Example: tshark -f
"predef:MyPredefinedHostOnlyFilter"

-F <file format>

Set the file format of the output capture file written using the
-w option. The output written with the -w option is raw packet
data, not text, so there is no -F option to request text output.
The option -F without a value will list the available formats.

-g

This option causes the output file(s) to be created with
group-read permission (meaning that the output file(s) can be
read by other members of the calling user's group).

-G [ <report type> ]

The -G option will cause TShark to dump one of several types of
glossaries and then exit. If no specific glossary type is
specified, then the fields report will be generated by default.
Using the report type of help lists all the current report types.

The available report types include:

column-formats Dumps the column formats understood by TShark.
There is one record per line. The fields are tab-delimited.

Field 1
format string (e.g. "%rD")

Field 2
text description of format string (e.g. "Dest port
(resolved)")

currentprefs Dumps a copy of the current preferences file to
stdout.

decodes Dumps the "layer type"/"decode as" associations to
stdout. There is one record per line. The fields are
tab-delimited.

Field 1
layer type, e.g. "tcp.port"

Field 2
selector in decimal

Field 3
"decode as" name, e.g. "http"

defaultprefs Dumps a default preferences file to stdout.

dissector-tables Dumps a list of dissector tables to stdout.
There is one record per line. The fields are tab-delimited.

Field 1
dissector table name, e.g. "tcp.port"

Field 2
name used for the dissector table in the GUI

Field 3
type (textual representation of the ftenum type)

Field 4
base for display (for integer types)

Field 5
protocol name

Field 6
"decode as" support

elastic-mapping Dumps the ElasticSearch mapping file to stdout.

fieldcount Dumps the number of header fields to stdout.

fields Dumps the contents of the registration database to
stdout. An independent program can take this output and format
it into nice tables or HTML or whatever. There is one record per
line. Each record is either a protocol or a header field,
differentiated by the first field. The fields are tab-delimited.

Protocols

Field 1
'P'

Field 2
descriptive protocol name

Field 3
protocol abbreviation

Header Fields

Field 1
'F'

Field 2
descriptive field name

Field 3
field abbreviation

Field 4
type (textual representation of the ftenum type)

Field 5
parent protocol abbreviation

Field 6
base for display (for integer types); "parent bitfield width"
for FT_BOOLEAN

Field 7
bitmask: format: hex: 0x....

Field 8
blurb describing field

folders Dumps various folders used by TShark. This is
essentially the same data reported in Wireshark's About | Folders
tab. There is one record per line. The fields are
tab-delimited.

Field 1
Folder type (e.g "Personal configuration:")

Field 2
Folder location (e.g. "/home/vagrant/.config/wireshark/")

ftypes Dumps the "ftypes" (fundamental types) understood by
TShark. There is one record per line. The fields are
tab-delimited.

Field 1
FTYPE (e.g "FT_IPv6")

Field 2
text description of type (e.g. "IPv6 address")

heuristic-decodes Dumps the heuristic decodes currently
installed. There is one record per line. The fields are
tab-delimited.

Field 1
underlying dissector (e.g. "tcp")

Field 2
name of heuristic decoder (e.g. ucp")

Field 3
heuristic enabled (e.g. "T" or "F")

help Displays the available report types.

plugins Dumps the plugins currently installed. There is one
record per line. The fields are tab-delimited.

Field 1
plugin library/Lua script/extcap executable (e.g.
"gryphon.so")

Field 2
plugin version (e.g. 0.0.4)

Field 3
plugin type ("dissector", "tap", "file type", etc.)

Field 4
full path to plugin file

protocols Dumps the protocols in the registration database to
stdout. An independent program can take this output and format
it into nice tables or HTML or whatever. There is one record per
line. The fields are tab-delimited.

Field 1
protocol name

Field 2
protocol short name

Field 3
protocol filter name

values Dumps the value_strings, range_strings or true/false
strings for fields that have them. There is one record per line.
Fields are tab-delimited. There are three types of records:
Value String, Range String and True/False String. The first
field, 'V', 'R' or 'T', indicates the type of record.

Value Strings

Field 1
'V'

Field 2
field abbreviation to which this value string corresponds

Field 3
Integer value

Field 4
String

Range Strings

Field 1
'R'

Field 2
field abbreviation to which this range string corresponds

Field 3
Integer value: lower bound

Field 4
Integer value: upper bound

Field 5
String

True/False Strings

Field 1
'T'

Field 2
field abbreviation to which this true/false string
corresponds

Field 3
True String

Field 4
False String

-h|--help

Print the version and options and exit.

-H <input hosts file>

Read a list of entries from a "hosts" file, which will then be
written to a capture file. Implies -W n. Can be called multiple
times.

The "hosts" file format is documented at
<https://en.wikipedia.org/wiki/Hosts_(file>).

-i|--interface <capture interface> | -

Set the name of the network interface or pipe to use for live
packet capture.

Network interface names should match one of the names listed in
"tshark -D" (described above); a number, as reported by "tshark
-D", can also be used. If you're using UNIX, "netstat -i",
"ifconfig -a" or "ip link" might also work to list interface
names, although not all versions of UNIX support the -a option to
ifconfig.

If no interface is specified, TShark searches the list of
interfaces, choosing the first non-loopback interface if there
are any non-loopback interfaces, and choosing the first loopback
interface if there are no non-loopback interfaces. If there are
no interfaces at all, TShark reports an error and doesn't start
the capture.

Pipe names should be either the name of a FIFO (named pipe) or
"-" to read data from the standard input. On Windows systems,
pipe names must be of the form "\\pipe\.*pipename*". Data read
from pipes must be in standard pcapng or pcap format. Pcapng data
must have the same endianness as the capturing host.

"TCP@<host>:<port>" causes TShark to attempt to connect to the
specified port on the specified host and read pcapng or pcap
data.

This option can occur multiple times. When capturing from
multiple interfaces, the capture file will be saved in pcapng
format.

-I|--monitor-mode

Put the interface in "monitor mode"; this is supported only on
IEEE 802.11 Wi-Fi interfaces, and supported only on some
operating systems.

Note that in monitor mode the adapter might disassociate from the
network with which it's associated, so that you will not be able
to use any wireless networks with that adapter. This could
prevent accessing files on a network server, or resolving host
names or network addresses, if you are capturing in monitor mode
and are not connected to another network with another adapter.

This option can occur multiple times. If used before the first
occurrence of the -i option, it enables the monitor mode for all
interfaces. If used after an -i option, it enables the monitor
mode for the interface specified by the last -i option occurring
before this option.

-j <protocol match filter>

Protocol match filter used for ek|json|jsonraw|pdml output file
types. Only the protocol's parent node is included. Child nodes
are only included if explicitly specified in the filter.

Example: tshark -j "ip ip.flags http"

-J <protocol match filter>

Protocol top level filter used for ek|json|jsonraw|pdml output
file types. The protocol's parent node and all child nodes are
included. Lower-level protocols must be explicitly specified in
the filter.

Example: tshark -J "tcp http"

-K <keytab>

Load kerberos crypto keys from the specified keytab file. This
option can be used multiple times to load keys from several
files.

Example: tshark -K krb5.keytab

-l

Flush the standard output after the information for each packet
is printed. (This is not, strictly speaking, line-buffered if -V
was specified; however, it is the same as line-buffered if -V
wasn't specified, as only one line is printed for each packet,
and, as -l is normally used when piping a live capture to a
program or script, so that output for a packet shows up as soon
as the packet is seen and dissected, it should work just as well
as true line-buffering. We do this as a workaround for a
deficiency in the Microsoft Visual C++ C library.)

This may be useful when piping the output of TShark to another
program, as it means that the program to which the output is
piped will see the dissected data for a packet as soon as TShark
sees the packet and generates that output, rather than seeing it
only when the standard output buffer containing that data fills
up.

-L|--list-data-link-types

List the data link types supported by the interface and exit.
The reported link types can be used for the -y option.

-n

Disable network object name resolution (such as hostname, TCP and
UDP port names); the -N option might override this one.

-N <name resolving flags>

Turn on name resolving only for particular types of addresses and
port numbers, with name resolving for other types of addresses
and port numbers turned off. This option overrides -n if both -N
and -n are present. This option and -n override the options from
the preferences, including preferences set via the -o option. If
both -N and -n options are not present, the values from the
preferences are used, which default to d, m, and N turned on and
the other options turned off. (NB, N does not actually do
anything without n enabled as well.)

The argument is a string that may contain the letters:

d to enable resolution from captured DNS packets

m to enable MAC address resolution

n to enable network address resolution

N to enable using external resolvers (e.g., DNS) for network
address resolution; no effect without n also enabled

t to enable transport-layer port number resolution

v to enable VLAN IDs to names resolution

-o <preference>:<value>

Set a preference value, overriding the default value and any
value read from a preference file. The argument to the option is
a string of the form prefname:value, where prefname is the name
of the preference (which is the same name that would appear in
the preference file), and value is the value to which it should
be set.

-O <protocols>

Similar to the -V option, but causes TShark to only show a
detailed view of the comma-separated list of protocols specified,
and show only the top-level detail line for all other protocols,
rather than a detailed view of all protocols. Use the output of
"tshark -G protocols" to find the abbreviations of the protocols
you can specify.

-p|--no-promiscuous-mode

Don't put the interface into promiscuous mode. Note that the
interface might be in promiscuous mode for some other reason;
hence, -p cannot be used to ensure that the only traffic that is
captured is traffic sent to or from the machine on which TShark
is running, broadcast traffic, and multicast traffic to addresses
received by that machine.

This option can occur multiple times. If used before the first
occurrence of the -i option, no interface will be put into the
promiscuous mode. If used after an -i option, the interface
specified by the last -i option occurring before this option will
not be put into the promiscuous mode.

-P|--print

Decode and display the packet summary or details, even if writing
raw packet data using the -w option, and even if packet output is
otherwise suppressed with -Q.

-q

When capturing packets, don't display the continuous count of
packets captured that is normally shown when saving a capture to
a file; instead, just display, at the end of the capture, a count
of packets captured. On systems that support the SIGINFO signal,
such as various BSDs, you can cause the current count to be
displayed by typing your "status" character (typically control-T,
although it might be set to "disabled" by default on at least
some BSDs, so you'd have to explicitly set it to use it).

When reading a capture file, or when capturing and not saving to
a file, don't print packet information; this is useful if you're
using a -z option to calculate statistics and don't want the
packet information printed, just the statistics.

-Q

When capturing packets, don't display, on the standard error, the
initial message indicating on which interfaces the capture is
being done, the continuous count of packets captured shown when
saving a capture to a file, and the final message giving the
count of packets captured. Only true errors are displayed on the
standard error.

only display true errors; don't display the initial message
indicating the. This outputs less than the -q option, so the
interface name and total packet count and the end of a capture
are not sent to stderr.

When reading a capture file, or when capturing and not saving to
a file, don't print packet information; this is useful if you're
using a -z option to calculate statistics and don't want the
packet information printed, just the statistics.

-r|--read-file <infile>

Read packet data from infile, can be any supported capture file
format (including gzipped files). It is possible to use named
pipes or stdin (-) here but only with certain (not compressed)
capture file formats (in particular: those that can be read
without seeking backwards).

-R|--read-filter <Read filter>

Cause the specified filter (which uses the syntax of read/display
filters, rather than that of capture filters) to be applied
during the first pass of analysis. Packets not matching the
filter are not considered for future passes. Only makes sense
with multiple passes, see -2. For regular filtering on
single-pass dissect see -Y instead.

Note that forward-looking fields such as 'response in frame #'
cannot be used with this filter, since they will not have been
calculate when this filter is applied.

-s|--snapshot-length <capture snaplen>

Set the default snapshot length to use when capturing live data.
No more than snaplen bytes of each network packet will be read
into memory, or saved to disk. A value of 0 specifies a snapshot
length of 262144, so that the full packet is captured; this is
the default.

This option can occur multiple times. If used before the first
occurrence of the -i option, it sets the default snapshot length.
If used after an -i option, it sets the snapshot length for the
interface specified by the last -i option occurring before this
option. If the snapshot length is not set specifically, the
default snapshot length is used if provided.

-S <separator>

Set the line separator to be printed between packets.

-t a|ad|adoy|d|dd|e|r|u|ud|udoy

Set the format of the packet timestamp printed in summary lines.
The format can be one of:

a absolute: The absolute time, as local time in your time zone,
is the actual time the packet was captured, with no date
displayed

ad absolute with date: The absolute date, displayed as
YYYY-MM-DD, and time, as local time in your time zone, is the
actual time and date the packet was captured

adoy absolute with date using day of year: The absolute date,
displayed as YYYY/DOY, and time, as local time in your time zone,
is the actual time and date the packet was captured

d delta: The delta time is the time since the previous packet was
captured

dd delta_displayed: The delta_displayed time is the time since
the previous displayed packet was captured

e epoch: The time in seconds since epoch (Jan 1, 1970 00:00:00)

r relative: The relative time is the time elapsed between the
first packet and the current packet

u UTC: The absolute time, as UTC, is the actual time the packet
was captured, with no date displayed

ud UTC with date: The absolute date, displayed as YYYY-MM-DD, and
time, as UTC, is the actual time and date the packet was captured

udoy UTC with date using day of year: The absolute date,
displayed as YYYY/DOY, and time, as UTC, is the actual time and
date the packet was captured

The default format is relative.

-T ek|fields|json|jsonraw|pdml|ps|psml|tabs|text

Set the format of the output when viewing decoded packet data.
The options are one of:

ek Newline delimited JSON format for bulk import into
Elasticsearch. It can be used with -j or -J to specify which
protocols to include or with -x to include raw hex-encoded packet
data. If -P is specified it will print the packet summary only,
with both -P and -V it will print the packet summary and packet
details. If neither -P or -V are used it will print the packet
details only. Example of usage to import data into
Elasticsearch:

tshark -T ek -j "http tcp ip" -P -V -x -r file.pcap > file.json
curl -H "Content-Type: application/x-ndjson" -XPOST http://elasticsearch:9200/_bulk --data-binary "@file.json"

Elastic requires a mapping file to be loaded as template for
packets-* index in order to convert Wireshark types to elastic
types. This file can be auto-generated with the command "tshark
-G elastic-mapping". Since the mapping file can be huge,
protocols can be selected by using the option
--elastic-mapping-filter:

tshark -G elastic-mapping --elastic-mapping-filter ip,udp,dns

fields The values of fields specified with the -e option, in a
form specified by the -E option. For example,

tshark -T fields -E separator=, -E quote=d

would generate comma-separated values (CSV) output suitable for
importing into your favorite spreadsheet program.

json JSON file format. It can be used with -j or -J to specify
which protocols to include or with -x option to include raw
hex-encoded packet data. Example of usage:

tshark -T json -r file.pcap
tshark -T json -j "http tcp ip" -x -r file.pcap

jsonraw JSON file format including only raw hex-encoded packet
data. It can be used with -j or -J to specify which protocols to
include. Example of usage:

tshark -T jsonraw -r file.pcap
tshark -T jsonraw -j "http tcp ip" -x -r file.pcap

pdml Packet Details Markup Language, an XML-based format for the
details of a decoded packet. This information is equivalent to
the packet details printed with the -V option. Using the --color
option will add color attributes to pdml output. These
attributes are nonstandard.

ps PostScript for a human-readable one-line summary of each of
the packets, or a multi-line view of the details of each of the
packets, depending on whether the -V option was specified.

psml Packet Summary Markup Language, an XML-based format for the
summary information of a decoded packet. This information is
equivalent to the information shown in the one-line summary
printed by default. Using the --color option will add color
attributes to pdml output. These attributes are nonstandard.

tabs Similar to the default text report except the human-readable
one-line summary of each packet will include an ASCII horizontal
tab (0x09) character as a delimiter between each column.

text Text of a human-readable one-line summary of each of the
packets, or a multi-line view of the details of each of the
packets, depending on whether the -V option was specified. This
is the default.

-u <seconds type>

Specifies the seconds type. Valid choices are:

s for seconds

hms for hours, minutes and seconds

-U <tap name>

PDUs export, exports PDUs from infile to outfile according to the
tap name given. Use -Y to filter.

Enter an empty tap name "" or a tap name of ? to get a list of
available names.

-v|--version

Print the version and exit.

-V

Cause TShark to print a view of the packet details.

-w <outfile> | -

Write raw packet data to outfile or to the standard output if
outfile is '-'.

Note

-w provides raw packet data, not text. If you want text
output
you need to redirect stdout (e.g. using '>'), don't use the
-w option for this.

-W <file format option>

Save extra information in the file if the format supports it.
For example,

tshark -F pcapng -W n

will save host name resolution records along with captured
packets.

Future versions of TShark may automatically change the capture
format to pcapng as needed.

The argument is a string that may contain the following letter:

n write network address resolution information (pcapng only)

-x

Cause TShark to print a hex and ASCII dump of the packet data
after printing the summary and/or details, if either are also
being displayed.

-X <eXtension options>

Specify an option to be passed to a TShark module. The eXtension
option is in the form extension_key:value, where extension_key
can be:

lua_script:lua_script_filename tells TShark to load the given
script in addition to the default Lua scripts.

lua_scriptnum:argument tells TShark to pass the given argument to
the lua script identified by 'num', which is the number indexed
order of the 'lua_script' command. For example, if only one
script was loaded with '-X lua_script:my.lua', then '-X
lua_script1:foo' will pass the string 'foo' to the 'my.lua'
script. If two scripts were loaded, such as '-X
lua_script:my.lua' and '-X lua_script:other.lua' in that order,
then a '-X lua_script2:bar' would pass the string 'bar' to the
second lua script, namely 'other.lua'.

read_format:file_format tells TShark to use the given file format
to read in the file (the file given in the -r command option).
Providing no file_format argument, or an invalid one, will
produce a file of available file formats to use.

-y|--linktype <capture link type>

Set the data link type to use while capturing packets. The
values reported by -L are the values that can be used.

This option can occur multiple times. If used before the first
occurrence of the -i option, it sets the default capture link
type. If used after an -i option, it sets the capture link type
for the interface specified by the last -i option occurring
before this option. If the capture link type is not set
specifically, the default capture link type is used if provided.

-Y|--display-filter <displaY filter>

Cause the specified filter (which uses the syntax of read/display
filters, rather than that of capture filters) to be applied
before printing a decoded form of packets or writing packets to a
file. Packets matching the filter are printed or written to
file; packets that the matching packets depend upon (e.g.,
fragments), are not printed but are written to file; packets not
matching the filter nor depended upon are discarded rather than
being printed or written.

Use this instead of -R for filtering using single-pass analysis.
If doing two-pass analysis (see -2) then only packets matching
the read filter (if there is one) will be checked against this
filter.

-M <auto session reset>

Automatically reset internal session when reached to specified
number of packets. for example,

tshark -M 100000

will reset session every 100000 packets.

This feature does not support -2 two-pass analysis

-z <statistics>

Get TShark to collect various types of statistics and display the
result after finishing reading the capture file. Use the -q
option if you're reading a capture file and only want the
statistics printed, not any per-packet information.

Statistics are calculated independently of the normal per-packet
output, unaffected by the main display filter. However, most have
their own optional filter parameter, and only packets that match
that filter (and any capture filter or read filter) will be used
in the calculations.

Note that the -z proto option is different - it doesn't cause
statistics to be gathered and printed when the capture is
complete, it modifies the regular packet summary output to
include the values of fields specified with the option.
Therefore you must not use the -q option, as that option would
suppress the printing of the regular packet summary output, and
must also not use the -V option, as that would cause packet
detail information rather than packet summary information to be
printed.

Some of the currently implemented statistics are:

-z help

Display all possible values for -z.

-z afp,srt[,filter]

Show Apple Filing Protocol service response time statistics.

-z ancp,tree[,filter]

Calculate statistics on Access Node Control Protocol message
types and adjacency packet codes.

-z ansi_a,bsmap[,filter]

Count the number of ANSI A-I/F BSMAP messages of each type.

-z ansi_a,dtap[,filter]

Count the number of ANSI A-I/F DTAP messages of each type.

-z ansi_map[,filter]

Count the number of ANSI MAP messages of each type, and calculate
the total number of bytes and average bytes of each message type.

-z bacapp_instanceid,tree[,filter]

Calculate statistics on BACnet APDUs, collated by instance ID.
Displayed information includes source and destination address and
service type.

-z bacapp_ip,tree[,filter]

Calculate statistics on BACnet APDUs, collated by source and
destination address. Displayed information includes service
type, object ID, and instance ID.

-z bacapp_objectid,tree[,filter]

Calculate statistics on BACnet APDUs, collated by object ID.
Displayed information includes source and destination address,
service type, and instance ID.

-z bacapp_service,tree[,filter]

Calculate statistics on BACnet APDUs, collated by service type.
Displayed information includes source and destination address,
object ID, and instance ID.

-z camel,counter[,filter]

Count the number of CAMEL messages for each opcode.

-z camel,srt[,filter]

Collect requests/response SRT (Service Response Time) data for
CAMEL. Data collected is number of request messages with
corresponding response of each CAMEL message type, along with the
minimum, maximum, and average response time.

-z collectd,tree[,filter]

Calculate statistics for collectd. The gathered statistics are
the number of collectd packets and the total number of value
segments, along with the host, plugin, and type of the values.

-z conv,type[,filter]

Create a table that lists all conversations that could be seen in
the capture. type specifies the conversation endpoint types for
which we want to generate the statistics; currently the supported
ones are:

"bluetooth" Bluetooth addresses
"eth" Ethernet addresses
"fc" Fibre Channel addresses
"fddi" FDDI addresses
"ip" IPv4 addresses
"ipv6" IPv6 addresses
"ipx" IPX addresses
"jxta" JXTA message addresses
"mptcp" Multipath TCP connections
"ncp" NCP connections
"rsvp" RSVP connections
"sctp" SCTP addresses
"sll" Linux "cooked mode" capture addresses
"tcp" TCP/IP socket pairs Both IPv4 and IPv6 are supported
"tr" Token Ring addresses
"udp" UDP/IP socket pairs Both IPv4 and IPv6 are supported
"usb" USB addresses
"wlan" IEEE 802.11 addresses
"wpan" IEEE 802.15.4 addresses
"zbee_nwk" ZigBee Network Layer addresses

The table is presented with one line for each conversation and
displays the number of packets/bytes in each direction as well as
the total number of packets/bytes. The table is sorted according
to the total number of frames.

-z credentials

Collect credentials (username/passwords) from packets. The report
includes the packet number, the protocol that had that
credential, the username and the password. For protocols just
using one single field as authentication, this is provided as a
password and a placeholder in place of the user. Currently
implemented protocols include FTP, HTTP, IMAP, POP, and SMTP.

-z dcerpc,srt,uuid,major.minor[,filter]

Collect call/reply SRT (Service Response Time) data for DCERPC
interface uuid, version major.minor. Data collected is the
number of calls for each procedure, MinSRT, MaxSRT and AvgSRT.

Example: -z dcerpc,srt,12345778-1234-abcd-ef00-0123456789ac,1.0
will collect data for the CIFS SAMR Interface.

This option can be used multiple times on the command line.

Example: -z
dcerpc,srt,12345778-1234-abcd-ef00-0123456789ac,1.0,ip.addr==1.2.3.4
will collect SAMR SRT statistics for a specific host.

-z dests,tree[,filter]

Calculate statistics on IPv4 destination addresses and the
protocols and ports appearing on each address.

-z dhcp,stat[,filter]

Show DHCP (BOOTP) statistics.

-z diameter,avp[,cmd.code,field,field,...]

This option enables extraction of most important diameter fields
from large capture files. Exactly one text line for each diameter
message with matched diameter.cmd.code will be printed.

Empty diameter command code or '' can be specified to mach any
*diameter.cmd.code

Example: -z diameter,avp extract default field set from diameter
messages.

Example: -z diameter,avp,280 extract default field set from
diameter DWR messages.

Example: -z diameter,avp,272 extract default field set from
diameter CC messages.

Extract most important fields from diameter CC messages:

tshark -r file.cap.gz -q -z
diameter,avp,272,CC-Request-Type,CC-Request-Number,Session-Id,Subscription-Id-Data,Rating-Group,Result-Code

Following fields will be printed out for each diameter message:

"frame" Frame number.
"time" Unix time of the frame arrival.
"src" Source address.
"srcport" Source port.
"dst" Destination address.
"dstport" Destination port.
"proto" Constant string 'diameter', which can be used for post processing of tshark output. E.g. grep/sed/awk.
"msgnr" seq. number of diameter message within the frame. E.g. '2' for the third diameter message in the same frame.
"is_request" '0' if message is a request, '1' if message is an answer.
"cmd" diameter.cmd_code, E.g. '272' for credit control messages.
"req_frame" Number of frame where matched request was found or '0'.
"ans_frame" Number of frame where matched answer was found or '0'.
"resp_time" response time in seconds, '0' in case if matched Request/Answer is not found in trace. E.g. in the begin or end of capture.

-z diameter,avp option is much faster than -V -T text or -T pdml
options.

-z diameter,avp option is more powerful than -T field and -z
proto,colinfo options.

Multiple diameter messages in one frame are supported.

Several fields with same name within one diameter message are
supported, e.g. diameter.Subscription-Id-Data or
diameter.Rating-Group.

Note: tshark -q option is recommended to suppress default TShark
output.

-z diameter,srt[,filter]

Collect requests/response SRT (Service Response Time) data for
Diameter. Data collected is number of request and response pairs
of each Diameter command code, Minimum SRT, Maximum SRT, Average
SRT, and Sum SRT. Currently no statistics are gathered on
unpaired messages.

-z dns,tree[,filter]

Create a summary of the captured DNS packets. General information
are collected such as qtype and qclass distribution. For some
data (as qname length or DNS payload) max, min and average values
are also displayed.

-z endpoints,type[,filter]

Create a table that lists all endpoints that could be seen in the
capture. type specifies the endpoint types for which we want to
generate the statistics; currently the supported ones are:

"bluetooth" Bluetooth addresses
"eth" Ethernet addresses
"fc" Fibre Channel addresses
"fddi" FDDI addresses
"ip" IPv4 addresses
"ipv6" IPv6 addresses
"ipx" IPX addresses
"jxta" JXTA message addresses
"mptcp" Multipath TCP connections
"ncp" NCP connections
"rsvp" RSVP connections
"sctp" SCTP addresses
"sll" Linux "cooked mode" capture addresses
"tcp" TCP/IP socket pairs Both IPv4 and IPv6 are supported
"tr" Token Ring addresses
"udp" UDP/IP socket pairs Both IPv4 and IPv6 are supported
"usb" USB addresses
"wlan" IEEE 802.11 addresses
"wpan" IEEE 802.15.4 addresses
"zbee_nwk" ZigBee Network Layer addresses

The table is presented with one line for each conversation and
displays the number of packets/bytes in each direction as well as
the total number of packets/bytes. The table is sorted according
to the total number of frames.

-z expert[,error|,warn|,note|,chat|,comment][,filter]

Collects information about all expert info, and will display them
in order, grouped by severity.

Example: -z expert,sip will show expert items of all severity for
frames that match the sip protocol.

This option can be used multiple times on the command line.

Example: -z "expert,note,tcp" will only collect expert items for
frames that include the tcp protocol, with a severity of note or
higher.

-z flow,name,mode[,filter]

Displays the flow of data between two nodes. Output is the same
as ASCII format saved from GUI.

name specifies the flow name. It can be one of:

any All frames
icmp ICMP
icmpv6 ICMPv6
lbm_uim UIM
tcp TCP

mode specifies the address type. It can be one of:

standard Any address
network Network address

Example: -z flow,tcp,network will show data flow for all TCP
frames

-z follow,prot,mode,filter[,range]

Displays the contents of a TCP or UDP stream between two nodes.
The data sent by the second node is prefixed with a tab to
differentiate it from the data sent by the first node.

prot specifies the transport protocol. It can be one of:

tcp TCP
udp UDP
tls TLS or SSL
http HTTP streams
http2 HTTP/2 streams
quic QUIC streams

mode specifies the output mode. It can be one of:

ascii ASCII output with dots for non-printable characters
ebcdic EBCDIC output with dots for non-printable characters
hex Hexadecimal and ASCII data with offsets
raw Hexadecimal data
yaml YAML format

Since the output in ascii or ebcdic mode may contain newlines,
the length of each section of output plus a newline precedes each
section of output.

filter specifies the stream to be displayed. There are three
formats:

ip-addr0:port0,ip-addr1:port1
stream-index
stream-index,substream-index

The first format specifies IP addresses and TCP or UDP port
pairs. (TCP ports are used for TLS, HTTP, and HTTP2; QUIC does
not support address and port matching because of connection
migration.)

The second format specifies stream indices, and is used for TCP,
UDP, TLS, and HTTP. (TLS and HTTP use TCP stream indices.)

The third format, specifying streams and substreams, is used for
HTTP/2 and QUIC due to their use of multiplexing. (TCP stream and
HTTP/2 stream indices for HTTP/2, QUIC connection number and
stream ID for QUIC.)

range optionally specifies which "chunks" of the stream should be
displayed.

Example: -z "follow,tcp,hex,1" will display the contents of the
second TCP stream (the first is stream 0) in "hex" format.

===================================================================
Follow: tcp,hex
Filter: tcp.stream eq 1
Node 0: 200.57.7.197:32891
Node 1: 200.57.7.198:2906
00000000 00 00 00 22 00 00 00 07 00 0a 85 02 07 e9 00 02 ...".... ........
00000010 07 e9 06 0f 00 0d 00 04 00 00 00 01 00 03 00 06 ........ ........
00000020 1f 00 06 04 00 00 ......
00000000 00 01 00 00 ....
00000026 00 02 00 00

Example: -z
"follow,tcp,ascii,200.57.7.197:32891,200.57.7.198:2906" will
display the contents of a TCP stream between 200.57.7.197 port
32891 and 200.57.7.98 port 2906.

===================================================================
Follow: tcp,ascii
Filter: (omitted for readability)
Node 0: 200.57.7.197:32891
Node 1: 200.57.7.198:2906
38
...".....
................
4
....

Example: -z "follow,http2,hex,0,1" will display the contents of a
HTTP/2 stream on the first TCP session (index 0) with HTTP/2
Stream ID 1.

===================================================================
Follow: http2,hex
Filter: tcp.stream eq 0 and http2.streamid eq 1
Node 0: 172.16.5.1:49178
Node 1: 172.16.5.10:8443
00000000 00 00 2c 01 05 00 00 00 01 82 04 8b 63 c1 ac 2a ..,..... ....c..*
00000010 27 1d 9d 57 ae a9 bf 87 41 8c 0b a2 5c 2e 2e da '..W.... A...\...
00000020 e1 05 c7 9a 69 9f 7a 88 25 b6 50 c3 ab b6 25 c3 ....i.z. %.P...%.
00000030 53 03 2a 2f 2a S.*/*
00000000 00 00 22 01 04 00 00 00 01 88 5f 87 35 23 98 ac .."..... .._.5#..
00000010 57 54 df 61 96 c3 61 be 94 03 8a 61 2c 6a 08 2f WT.a..a. ...a,j./
00000020 34 a0 5b b8 21 5c 0b ea 62 d1 bf 4.[.!\.. b..
0000002B 00 40 00 00 00 00 00 00 01 89 50 4e 47 0d 0a 1a .@...... ..PNG...

-z gsm_a

Count the number of GSM A-I/F messages of each type within the
following categories: BSSMAP, DTAP Mobility Management, DTAP
Radio Resource Management, DTAP Call Control, DTAP GPRS Mobility
Management, DTAP SMS messages, DTAP GPRS Session Management, DTAP
Supplementary Services, DTAP Special Conformance Testing
Functions, and SACCH Radio Resource Management.

Unlike the individual statistics for each category that follow,
this only prints a line for each message type that appears,
instead of including lines for message types with a count of
zero.

-z gsm_a,category[,filter]

Count the number of messages of each type in GSM A-I/F category,
which can be one of:

bssmap BSSMAP
dtap_cc DTAP Call Control
dtap_gmm DTAP GPRS Mobility Management
dtap_mm DTAP Mobility Management
dtap_rr DTAP Radio Resource Management
dtap_sacch SACCH Radio Resource Management
dtap_sm DTAP GPRS Session Managment
dtap_sms DTAP Short Message Service
dtap_ss DTAP Supplementary Services
dtap_tp DTAP Special Conformance Testing Functions

-z gsm_map,operation[,filter]

Calculate statistics on GSM MAP. For each op code, the total
number of invokes and results, along with the average and total
bytes for invokes and results separately and combined is
displayed.

-z gtp,srt[,filter]

Collect requests/response SRT (Service Response Time) data for
GTP. Data collected is the number of calls, mimimum SRT, maximum
SRT, average SRT, and sum SRT for Echo and Create/Update/Delete
PDP context commands only. Currently no statistics are gathered
on unpaired messages.

-z h225,counter[,filter]

Count ITU-T H.225 messages and their reasons. In the first
column you get a list of H.225 messages and H.225 message
reasons, which occur in the current capture file. The number of
occurrences of each message or reason is displayed in the second
column.

Example: -z h225,counter.

Example: use -z "h225,counter,ip.addr==1.2.3.4" to only collect
stats for H.225 packets exchanged by the host at IP address
1.2.3.4 .

This option can be used multiple times on the command line.

-z h225_ras,rtd[,filter]

Collect requests/response RTD (Response Time Delay) data for
ITU-T H.225 RAS. Data collected is number of calls of each ITU-T
H.225 RAS Message Type, Minimum RTD, Maximum RTD, Average RTD,
Minimum in Frame, and Maximum in Frame. You will also get the
number of Open Requests (Unresponded Requests), Discarded
Responses (Responses without matching request) and Duplicate
Messages.

Example: tshark -z h225_ras,rtd

This option can be used multiple times on the command line.

Example: -z "h225_ras,rtd,ip.addr==1.2.3.4" will only collect
stats for ITU-T H.225 RAS packets exchanged by the host at IP
address 1.2.3.4 .

-z hart_ip,tree,[,filter]

Calculate statistics on HART-IP packets, grouping by message
types and message IDs within types.

-z hosts[,ip][,ipv4][,ipv6]

Dump any collected resolved IPv4 and/or IPv6 addresses in "hosts"
format. Both IPv4 and IPv6 addresses are dumped by default. "ip"
argument will dump only IPv4 addresses.

Addresses are collected from a number of sources, including
standard "hosts" files and captured traffic. Resolution must be
enabled, e.g. through the -n option.

-z hpfeeds,tree[,filter]

Calculate statistics for HPFEEDS traffic such as publish per
channel, and opcode distribution.

-z http,stat[,filter]

Count the HTTP response status codes and the HTTP request
methods.

-z http,tree[,filter]

Calculate the HTTP packet distribution. Displayed values are the
response status codes and request methods.

-z http_req,tree[,filter]

Calculate the HTTP requests by server. Displayed values are the
server name and the URI path.

-z http_seq,tree[,filter]

Calculate the HTTP request sequence statistics, which correlate
referring URIs with request URIs.

-z http_srv,tree[,filter]

Calculate the HTTP requests and responses by server. For the HTTP
requests, displayed values are the server IP address and server
hostname. For the HTTP responses, displayed values are the server
IP address and status.

-z http2,tree[,filter]

Calculate the HTTP/2 packet distribution. Displayed values are
the frame types.

-z icmp,srt[,filter]

Compute total ICMP echo requests, replies, loss, and percent
loss, as well as minimum, maximum, mean, median and sample
standard deviation SRT statistics typical of what ping provides.

Example: -z icmp,srt,ip.src==1.2.3.4 will collect ICMP SRT
statistics for ICMP echo request packets originating from a
specific host.

This option can be used multiple times on the command line.

-z icmpv6,srt[,filter]

Compute total ICMPv6 echo requests, replies, loss, and percent
loss, as well as minimum, maximum, mean, median and sample
standard deviation SRT statistics typical of what ping provides.

Example: -z icmpv6,srt,ipv6.src==fe80::1 will collect ICMPv6 SRT
statistics for ICMPv6 echo request packets originating from a
specific host.

This option can be used multiple times on the command line.

-z io,phs[,filter]

Create Protocol Hierarchy Statistics listing both number of
packets and bytes.

This option can be used multiple times on the command line.

-z io,stat,interval[,filter][,filter][,filter]...

Collect packet/bytes statistics for the capture in intervals of
interval seconds. Interval can be specified either as a whole or
fractional second and can be specified with microsecond (us)
resolution. If interval is 0, the statistics will be calculated
over all packets.

If one or more filters are specified statistics will be
calculated for all filters and presented with one column of
statistics for each filter.

This option can be used multiple times on the command line.

Example: -z io,stat,1,ip.addr==1.2.3.4 will generate 1 second
statistics for all traffic to/from host 1.2.3.4.

Example: -z "io,stat,0.001,smb&&ip.addr==1.2.3.4" will generate
1ms statistics for all SMB packets to/from host 1.2.3.4.

The examples above all use the standard syntax for generating
statistics which only calculates the number of packets and bytes
in each interval.

io,stat can also do much more statistics and calculate COUNT(),
SUM(), MIN(), MAX(), AVG() and LOAD() using a slightly different
filter syntax:

-z io,stat,interval,"COUNT|SUM|MIN|MAX|AVG|LOAD(field)filter"

Note

One important thing to note here is that the filter is not
optional
and that the field that the calculation is based on MUST be
part of the filter string or the calculation will fail.

So: -z io,stat,0.010,AVG(smb.time) does not work. Use -z
io,stat,0.010,AVG(smb.time)smb.time instead. Also be aware that
a field can exist multiple times inside the same packet and will
then be counted multiple times in those packets.

Note

A second important thing to note is that the system setting
for
decimal separator must be set to "."! If it is set to "," the
statistics will not be displayed per filter.

COUNT - Calculates the number of times that the field name (not
its value) appears per interval in the filtered packet list.
''field'' can be any display filter name.

Example: -z io,stat,0.010,"COUNT(smb.sid)smb.sid"

This will count the total number of SIDs seen in each 10ms
interval.

SUM - Unlike COUNT, the values of the specified field are summed
per time interval. ''field'' can only be a named integer, float,
double or relative time field.

Example: tshark -z io,stat,0.010,"SUM(frame.len)frame.len"

Reports the total number of bytes that were transmitted
bidirectionally in all the packets within a 10 millisecond
interval.

MIN/MAX/AVG - The minimum, maximum, or average field value in
each interval is calculated. The specified field must be a named
integer, float, double or relative time field. For relative time
fields, the output is presented in seconds with six decimal
digits of precision rounded to the nearest microsecond.

In the following example, the time of the first Read_AndX call,
the last Read_AndX response values are displayed and the minimum,
maximum, and average Read response times (SRTs) are calculated.
NOTE: If the DOS command shell line continuation character, ''^''
is used, each line cannot end in a comma so it is placed at the
beginning of each continuation line:

tshark -o tcp.desegment_tcp_streams:FALSE -n -q -r smb_reads.cap -z io,stat,0,
"MIN(frame.time_relative)frame.time_relative and smb.cmd==0x2e and smb.flags.response==0",
"MAX(frame.time_relative)frame.time_relative and smb.cmd==0x2e and smb.flags.response==1",
"MIN(smb.time)smb.time and smb.cmd==0x2e",
"MAX(smb.time)smb.time and smb.cmd==0x2e",
"AVG(smb.time)smb.time and smb.cmd==0x2e"

======================================================================================================
IO Statistics
Column #0: MIN(frame.time_relative)frame.time_relative and smb.cmd==0x2e and smb.flags.response==0
Column #1: MAX(frame.time_relative)frame.time_relative and smb.cmd==0x2e and smb.flags.response==1
Column #2: MIN(smb.time)smb.time and smb.cmd==0x2e
Column #3: MAX(smb.time)smb.time and smb.cmd==0x2e
Column #4: AVG(smb.time)smb.time and smb.cmd==0x2e
| Column #0 | Column #1 | Column #2 | Column #3 | Column #4 |
Time | MIN | MAX | MIN | MAX | AVG |
000.000- 0.000000 7.704054 0.000072 0.005539 0.000295
======================================================================================================

The following command displays the average SMB Read response PDU
size, the total number of read PDU bytes, the average SMB Write
request PDU size, and the total number of bytes transferred in
SMB Write PDUs:

tshark -n -q -r smb_reads_writes.cap -z io,stat,0,
"AVG(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2e and smb.response_to",
"SUM(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2e and smb.response_to",
"AVG(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2f and not smb.response_to",
"SUM(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2f and not smb.response_to"

=====================================================================================
IO Statistics
Column #0: AVG(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2e and smb.response_to
Column #1: SUM(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2e and smb.response_to
Column #2: AVG(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2f and not smb.response_to
Column #3: SUM(smb.file.rw.length)smb.file.rw.length and smb.cmd==0x2f and not smb.response_to
| Column #0 | Column #1 | Column #2 | Column #3 |
Time | AVG | SUM | AVG | SUM |
000.000- 30018 28067522 72 3240
=====================================================================================

LOAD - The LOAD/Queue-Depth in each interval is calculated. The
specified field must be a relative time field that represents a
response time. For example smb.time. For each interval the
Queue-Depth for the specified protocol is calculated.

The following command displays the average SMB LOAD. A value of
1.0 represents one I/O in flight.

tshark -n -q -r smb_reads_writes.cap
-z "io,stat,0.001,LOAD(smb.time)smb.time"

============================================================================
IO Statistics
Interval: 0.001000 secs
Column #0: LOAD(smb.time)smb.time
| Column #0 |
Time | LOAD |
0000.000000-0000.001000 1.000000
0000.001000-0000.002000 0.741000
0000.002000-0000.003000 0.000000
0000.003000-0000.004000 1.000000

FRAMES | BYTES[()filter] - Displays the total number of frames or
bytes. The filter field is optional but if included it must be
prepended with ''()''.

The following command displays five columns: the total number of
frames and bytes (transferred bidirectionally) using a single
comma, the same two stats using the FRAMES and BYTES subcommands,
the total number of frames containing at least one SMB Read
response, and the total number of bytes transmitted to the client
(unidirectionally) at IP address 10.1.0.64.

tshark -o tcp.desegment_tcp_streams:FALSE -n -q -r smb_reads.cap -z io,stat,0,,FRAMES,BYTES,
"FRAMES()smb.cmd==0x2e and smb.response_to","BYTES()ip.dst==10.1.0.64"

=======================================================================================================================
IO Statistics
Column #0:
Column #1: FRAMES
Column #2: BYTES
Column #3: FRAMES()smb.cmd==0x2e and smb.response_to
Column #4: BYTES()ip.dst==10.1.0.64
| Column #0 | Column #1 | Column #2 | Column #3 | Column #4 |
Time | Frames | Bytes | FRAMES | BYTES | FRAMES | BYTES |
000.000- 33576 29721685 33576 29721685 870 29004801
=======================================================================================================================

-z ip_hosts,tree[,filter]

Calculate statistics on IPv4 addresses, with source and
destination addresses all grouped together.

-z ip_srcdst,tree[,filter]

Calculate statistics on IPv4 addresses, with source and
destination addresses separated into separate categories.

-z ip6_dests,tree[,filter]

Calculate statistics on IPv6 destination addresses and the
protocols and ports appearing on each address.

-z ip6_hosts,tree[,filter]

Calculate statistics on IPv6 addresses, with source and
destination addresses all grouped together.

-z ip6_ptype,tree[,filter]

Calculate statistics on port types that occur on IPv6 packets.

-z ip6_srcdst,tree[,filter]

Calculate statistics on IPv6 addresses, with source and
destination addresses separated into separate categories.

-z isup_msg,tree[,filter]

Calculate statistics on ISUP messages. Displayed information is
message types and direction (originating point code and
destination point code.)

-z mac-lte,stat[,filter]

This option will activate a counter for LTE MAC messages. You
will get information about the maximum number of UEs/TTI, common
messages and various counters for each UE that appears in the
log.

Example: tshark -z mac-lte,stat.

This option can be used multiple times on the command line.

Example: -z "mac-lte,stat,mac-lte.rnti>3000" will only collect
stats for UEs with an assigned RNTI whose value is more than
3000.

-z megaco,rtd[,filter]

Collect requests/response RTD (Response Time Delay) data for
MEGACO. (This is similar to -z smb,srt). Data collected is the
number of calls for each known MEGACO Type, MinRTD, MaxRTD and
AvgRTD. Additionally you get the number of duplicate
requests/responses, unresponded requests, responses, which don't
match with any request. Example: -z megaco,rtd.

Example: -z "megaco,rtd,ip.addr==1.2.3.4" will only collect stats
for MEGACO packets exchanged by the host at IP address 1.2.3.4 .

This option can be used multiple times on the command line.

-z mgcp,rtd[,filter]

Collect requests/response RTD (Response Time Delay) data for
MGCP. (This is similar to -z smb,srt). Data collected is the
number of calls for each known MGCP Type, MinRTD, MaxRTD and
AvgRTD. Additionally you get the number of duplicate
requests/responses, unresponded requests, responses, which don't
match with any request. Example: -z mgcp,rtd.

This option can be used multiple times on the command line.

Example: -z "mgcp,rtd,ip.addr==1.2.3.4" will only collect stats
for MGCP packets exchanged by the host at IP address 1.2.3.4 .

-z mtp3,msus[,filter]

Calculate statisics on MTP3 MSUs. For each combination of
originating point code, destination point code, and service
indicator, calculates the total number of MSUs, the total bytes,
and the average bytes per MSU.

-z ncp,srt[,filter]

Collect requests/response SRT (Service Response Time) data for
Netware Core Protocol. Minimum SRT, maximum SRT, average SRT,
and sum SRT is displayed for request/response pairs, organized by
group, function and subfunction, and verb. No statistics are
gathered on unpaired messages.

-z osmux,tree[,filter]

Calculate statistics for the OSmux voice/signaling multiplex
protocol. Displays the total number of OSmux packets, and
displays for each stream the number of packets, number of packets
with the RTP market bit set, number of AMR frames, jitter
analysis, and sequence number analysis.

-z plen,tree[,filter]

Calculate statistics on packet lengths. Packets are grouped into
buckets that grow exponentially with powers of two.

-z proto,colinfo,filter,field

Append all field values for the packet to the Info column of the
one-line summary output. This feature can be used to append
arbitrary fields to the Info column in addition to the normal
content of that column. field is the display-filter name of a
field which value should be placed in the Info column. filter is
a filter string that controls for which packets the field value
will be presented in the info column. field will only be
presented in the Info column for the packets which match filter.

Note

In order for TShark to be able to extract the field value
from the packet, field MUST be part of the filter string. If
not, TShark will not be able to extract its value.

For a simple example to add the "nfs.fh.hash" field to the Info
column for all packets containing the "nfs.fh.hash" field, use

-z proto,colinfo,nfs.fh.hash,nfs.fh.hash

To put "nfs.fh.hash" in the Info column but only for packets
coming from host 1.2.3.4 use:

-z "proto,colinfo,nfs.fh.hash && ip.src==1.2.3.4,nfs.fh.hash"

This option can be used multiple times on the command line.

-z ptype,tree[,filter]

Calculate statistics on port types that occur on IPv4 packets.

-z radius,rtd[,filter]

Collect requests/response RTD (Response Time Delay) data for
RAIDUS. The data collected for each RADIUS code is the number of
calls, Minimum RTD, Maximum RTD, Average RTD, Minimum in Frame,
and Maximum in Frame, along with the number of Open Requests
(Unresponded Requests), Discarded Responses (Responses without
matching request) and Duplicate Messages.

-z rlc-lte,stat[,filter]

This option will activate a counter for LTE RLC messages. You
will get information about common messages and various counters
for each UE that appears in the log.

Example: tshark -z rlc-lte,stat.

This option can be used multiple times on the command line.

Example: -z "rlc-lte,stat,rlc-lte.ueid>3000" will only collect
stats for UEs with a UEId of more than 3000.

-z rpc,programs

Collect call/reply SRT data for all known ONC-RPC
programs/versions. Data collected is number of calls for each
protocol/version, MinSRT, MaxSRT and AvgSRT. This option can
only be used once on the command line.

-z rpc,srt,program,version[,filter]

Collect call/reply SRT (Service Response Time) data for
program/version. Data collected is the number of calls for each
procedure, MinSRT, MaxSRT, AvgSRT, and the total time taken for
each procedure.

Example: tshark -z rpc,srt,100003,3 will collect data for NFS v3.

This option can be used multiple times on the command line.

Example: -z rpc,srt,100003,3,nfs.fh.hash==0x12345678 will collect
NFS v3 SRT statistics for a specific file.

-z rtp,streams

Collect statistics for all RTP streams and calculate max. delta,
max. and mean jitter and packet loss percentages.

-z rtsp,stat[,filter]

Count the RTSP response status codes and the RSTP request
methods.

-z rtsp,tree[,filter]

Calculate the RTSP packet distribution. Displayed values are the
response status codes and request methods.

-z sametime,tree[,filter]

Calculate statistics on SAMETIME messages. Displayed values are
the messages type, send type, and user status.

-z scsi,srt,cmdset[,filter]

Collect call/reply SRT (Service Response Time) data for SCSI
commandset cmdset.

Commandsets are 0:SBC 1:SSC 5:MMC

Data collected is the number of calls for each procedure, MinSRT,
MaxSRT and AvgSRT.

Example: -z scsi,srt,0 will collect data for SCSI BLOCK COMMANDS
(SBC).

This option can be used multiple times on the command line.

Example: -z scsi,srt,0,ip.addr==1.2.3.4 will collect SCSI SBC SRT
statistics for a specific iscsi/ifcp/fcip host.

-z sctp,stat

Activate a counter for SCTP chunks. In addition to the total
number of SCTP packets, for each source and destination address
and port combination the number of chunks of the most common
types (DATA, SACK, HEARTBEAT, HEARTBEAT ACK, INIT, INIT ACK,
COOKIE ECHO, COOKIE ACK, ABORT, and ERROR) are displayed.

-z sip,stat[,filter]

This option will activate a counter for SIP messages. You will
get the number of occurrences of each SIP Method and of each SIP
Status-Code. Additionally you also get the number of resent SIP
Messages (only for SIP over UDP).

Example: -z sip,stat.

This option can be used multiple times on the command line.

Example: -z "sip,stat,ip.addr==1.2.3.4" will only collect stats
for SIP packets exchanged by the host at IP address 1.2.3.4 .

-z smb,sids

When this feature is used TShark will print a report with all the
discovered SID and account name mappings. Only those SIDs where
the account name is known will be presented in the table.

For this feature to work you will need to either to enable
"Edit/Preferences/Protocols/SMB/Snoop SID to name mappings" in
the preferences or you can override the preferences by specifying
-o "smb.sid_name_snooping:TRUE" on the TShark command line.

The current method used by TShark to find the SID->name mapping
is relatively restricted with a hope of future expansion.

-z smb2,srt[,filter]

Collect call/reply SRT (Service Response Time) data for SMB
versions 2 and 3. The data collected for each normal command
type is the number of calls, MinSRT, MaxSRT, AvgSRT, and SumSRT.
No data is collected on cancel or oplock break requests, or on
unpaired commands. Only the first response to a given request is
used; retransmissions are not included in the calculation.

-z smpp_commands,tree[,filter]

Calculate the SMPP command distribution. Displayed values are
command IDs for both requests and responses, and status for
responses.

-z snmp,srt[,filter]

Collect call/reply SRT (Service Response Time) data for SNMP. The
data collected for each PDU type is the number of
request/response pairs, MinSRT, MaxSRT, AvgSRT, and SumSRT. No
data is collected on unpaired messages.

-z sv

Print out the time since the start of the capture and sample
count for each IEC 61850 Sampled Values packet.

-z ucp_messages,tree[,filter]

Calculate the message distribution of UCP packets. Displayed
values are operation types for both operations and results, and
whether results are positive or negative, with error codes
displayed for negative results.

-z wsp,stat[,filter]

Count the PDU types and the status codes of reply packets for WSP
packets.

--capture-comment <comment>

Add a capture comment to the output file, if supported by the
output file format.

This option may be specified multiple times. Note that Wireshark
currently only displays the first comment of a capture file.

--list-time-stamp-types

List time stamp types supported for the interface. If no time
stamp type can be set, no time stamp types are listed.

--time-stamp-type <type>

Change the interface's timestamp method.

--color

Enable coloring of packets according to standard Wireshark color
filters. On Windows colors are limited to the standard console
character attribute colors. Other platforms require a terminal
that handles 24-bit "true color" terminal escape sequences. See
<https://gitlab.com/wireshark/wireshark/-/wikis/ColoringRules>
for more information on configuring color filters.

--no-duplicate-keys

If a key appears multiple times in an object, only write it a
single time with as value a json array containing all the
separate values. (Only works with -T json)

--elastic-mapping-filter <protocol>,<protocol>,...

When generating the ElasticSearch mapping file, only put the
specified protocols in it, to avoid a huge mapping file that can
choke some software (such as Kibana). The option takes a list of
wanted protocol abbreviations, separated by comma.

Example: ip,udp,dns puts only those three protocols in the
mapping file.

--export-objects <protocol>,<destdir>

Export all objects within a protocol into directory destdir. The
available values for protocol can be listed with --export-objects
help.

The objects are directly saved in the given directory. Filenames
are dependent on the dissector, but typically it is named after
the basename of a file. Duplicate files are not overwritten,
instead an increasing number is appended before the file
extension.

This interface is subject to change, adding the possibility to
filter on files.

--enable-protocol <proto_name>

Enable dissection of proto_name.

--disable-protocol <proto_name>

Disable dissection of proto_name.

--enable-heuristic <short_name>

Enable dissection of heuristic protocol.

--disable-heuristic <short_name>

Disable dissection of heuristic protocol.

CAPTURE FILTER SYNTAX

See the manual page of pcap-filter(7) or, if that doesn't exist,
tcpdump(8), or, if that doesn't exist,
<https://gitlab.com/wireshark/wireshark/-/wikis/CaptureFilters>.

READ FILTER SYNTAX

For a complete table of protocol and protocol fields that are
filterable in TShark see the wireshark-filter(4) manual page.

FILES

These files contains various Wireshark configuration values.

Preferences

The preferences files contain global (system-wide) and personal
preference settings. If the system-wide preference file exists,
it is read first, overriding the default settings. If the
personal preferences file exists, it is read next, overriding any
previous values. Note: If the command line option -o is used
(possibly more than once), it will in turn override values from
the preferences files.

The preferences settings are in the form prefname:value, one per
line, where prefname is the name of the preference and value is
the value to which it should be set; white space is allowed
between : and value. A preference setting can be continued on
subsequent lines by indenting the continuation lines with white
space. A # character starts a comment that runs to the end of
the line:

# Capture in promiscuous mode?
# TRUE or FALSE (case-insensitive).
capture.prom_mode: TRUE

The global preferences file is looked for in the wireshark
directory under the share subdirectory of the main installation
directory (for example, /usr/local/share/wireshark/preferences)
on UNIX-compatible systems, and in the main installation
directory (for example, C:\Program Files\Wireshark\preferences)
on Windows systems.

The personal preferences file is looked for in
$XDG_CONFIG_HOME/wireshark/preferences (or, if
$XDG_CONFIG_HOME/wireshark does not exist while $HOME/.wireshark
is present, $HOME/.wireshark/preferences) on UNIX-compatible
systems and %APPDATA%\Wireshark\preferences (or, if %APPDATA%
isn't defined, %USERPROFILE%\Application
Data\Wireshark\preferences) on Windows systems.

Disabled (Enabled) Protocols

The disabled_protos files contain system-wide and personal lists
of protocols that have been disabled, so that their dissectors
are never called. The files contain protocol names, one per
line, where the protocol name is the same name that would be used
in a display filter for the protocol:

http
tcp # a comment

The global disabled_protos file uses the same directory as the
global preferences file.

The personal disabled_protos file uses the same directory as the
personal preferences file.

Name Resolution (hosts)

If the personal hosts file exists, it is used to resolve IPv4 and
IPv6 addresses before any other attempts are made to resolve
them. The file has the standard hosts file syntax; each line
contains one IP address and name, separated by whitespace. The
same directory as for the personal preferences file is used.

Capture filter name resolution is handled by libpcap on
UNIX-compatible systems and Npcap or WinPcap on Windows. As such
the Wireshark personal hosts file will not be consulted for
capture filter name resolution.

Name Resolution (subnets)

If an IPv4 address cannot be translated via name resolution (no
exact match is found) then a partial match is attempted via the
subnets file.

Each line of this file consists of an IPv4 address, a subnet mask
length separated only by a / and a name separated by whitespace.
While the address must be a full IPv4 address, any values beyond
the mask length are subsequently ignored.

An example is:

# Comments must be prepended by the # sign! 192.168.0.0/24
ws_test_network

A partially matched name will be printed as
"subnet-name.remaining-address". For example, "192.168.0.1"
under the subnet above would be printed as "ws_test_network.1";
if the mask length above had been 16 rather than 24, the printed
address would be ``ws_test_network.0.1".

Name Resolution (ethers)

The ethers files are consulted to correlate 6-byte hardware
addresses to names. First the personal ethers file is tried and
if an address is not found there the global ethers file is tried
next.

Each line contains one hardware address and name, separated by
whitespace. The digits of the hardware address are separated by
colons (:), dashes (-) or periods (.). The same separator
character must be used consistently in an address. The following
three lines are valid lines of an ethers file:

ff:ff:ff:ff:ff:ff Broadcast
c0-00-ff-ff-ff-ff TR_broadcast
00.00.00.00.00.00 Zero_broadcast

The global ethers file is looked for in the /etc directory on
UNIX-compatible systems, and in the main installation directory
(for example, C:\Program Files\Wireshark) on Windows systems.

The personal ethers file is looked for in the same directory as
the personal preferences file.

Capture filter name resolution is handled by libpcap on
UNIX-compatible systems and Npcap or WinPcap on Windows. As such
the Wireshark personal ethers file will not be consulted for
capture filter name resolution.

Name Resolution (manuf)

The manuf file is used to match the 3-byte vendor portion of a
6-byte hardware address with the manufacturer's name; it can also
contain well-known MAC addresses and address ranges specified
with a netmask. The format of the file is the same as the ethers
files, except that entries of the form:

00:00:0C Cisco

can be provided, with the 3-byte OUI and the name for a vendor,
and entries such as:

00-00-0C-07-AC/40 All-HSRP-routers

can be specified, with a MAC address and a mask indicating how
many bits of the address must match. The above entry, for
example, has 40 significant bits, or 5 bytes, and would match
addresses from 00-00-0C-07-AC-00 through 00-00-0C-07-AC-FF. The
mask need not be a multiple of 8.

The manuf file is looked for in the same directory as the global
preferences file.

Name Resolution (services)

The services file is used to translate port numbers into names.

The file has the standard services file syntax; each line
contains one (service) name and one transport identifier
separated by white space. The transport identifier includes one
port number and one transport protocol name (typically tcp, udp,
or sctp) separated by a /.

An example is:

mydns 5045/udp # My own Domain Name Server
mydns 5045/tcp # My own Domain Name Server

Name Resolution (ipxnets)

The ipxnets files are used to correlate 4-byte IPX network
numbers to names. First the global ipxnets file is tried and if
that address is not found there the personal one is tried next.

The format is the same as the ethers file, except that each
address is four bytes instead of six. Additionally, the address
can be represented as a single hexadecimal number, as is more
common in the IPX world, rather than four hex octets. For
example, these four lines are valid lines of an ipxnets file:

C0.A8.2C.00 HR
c0-a8-1c-00 CEO
00:00:BE:EF IT_Server1
110f FileServer3

The global ipxnets file is looked for in the /etc directory on
UNIX-compatible systems, and in the main installation directory
(for example, C:\Program Files\Wireshark) on Windows systems.

The personal ipxnets file is looked for in the same directory as
the personal preferences file.

OUTPUT

TShark uses UTF-8 to represent strings internally. In some cases the
output might not be valid. For example, a dissector might generate
invalid UTF-8 character sequences. Programs reading TShark output
should expect UTF-8 and be prepared for invalid output.

If TShark detects that it is writing to a TTY on UNIX or Linux and
the locale does not support UTF-8, output will be re-encoded to match
the current locale.

If TShark detects that it is writing to the console on Windows,
dissection output will be encoded as UTF-16LE. Other output will be
UTF-8. If extended characters don't display properly in your terminal
you might try setting your console code page to UTF-8 (chcp 65001)
and using a modern terminal application if possible.

ENVIRONMENT VARIABLES

WIRESHARK_CONFIG_DIR

This environment variable overrides the location of personal
configuration files. It defaults to $XDG_CONFIG_HOME/wireshark
(or $HOME/.wireshark if the former is missing while the latter
exists). On Windows, %APPDATA%\Wireshark is used instead.
Available since Wireshark 3.0.

WIRESHARK_DEBUG_WMEM_OVERRIDE

Setting this environment variable forces the wmem framework to
use the specified allocator backend for all allocations,
regardless of which backend is normally specified by the code.
This is mainly useful to developers when testing or debugging.
See README.wmem in the source distribution for details.

WIRESHARK_RUN_FROM_BUILD_DIRECTORY

This environment variable causes the plugins and other data files
to be loaded from the build directory (where the program was
compiled) rather than from the standard locations. It has no
effect when the program in question is running with root (or
setuid) permissions on *NIX.

WIRESHARK_DATA_DIR

This environment variable causes the various data files to be
loaded from a directory other than the standard locations. It
has no effect when the program in question is running with root
(or setuid) permissions on *NIX.

ERF_RECORDS_TO_CHECK

This environment variable controls the number of ERF records
checked when deciding if a file really is in the ERF format.
Setting this environment variable a number higher than the
default (20) would make false positives less likely.

IPFIX_RECORDS_TO_CHECK

This environment variable controls the number of IPFIX records
checked when deciding if a file really is in the IPFIX format.
Setting this environment variable a number higher than the
default (20) would make false positives less likely.

WIRESHARK_ABORT_ON_DISSECTOR_BUG

If this environment variable is set, TShark will call abort(3)
when a dissector bug is encountered. abort(3) will cause the
program to exit abnormally; if you are running TShark in a
debugger, it should halt in the debugger and allow inspection of
the process, and, if you are not running it in a debugger, it
will, on some OSes, assuming your environment is configured
correctly, generate a core dump file. This can be useful to
developers attempting to troubleshoot a problem with a protocol
dissector.

WIRESHARK_ABORT_ON_TOO_MANY_ITEMS

If this environment variable is set, TShark will call abort(3) if
a dissector tries to add too many items to a tree (generally this
is an indication of the dissector not breaking out of a loop soon
enough). abort(3) will cause the program to exit abnormally; if
you are running TShark in a debugger, it should halt in the
debugger and allow inspection of the process, and, if you are not
running it in a debugger, it will, on some OSes, assuming your
environment is configured correctly, generate a core dump file.
This can be useful to developers attempting to troubleshoot a
problem with a protocol dissector.

WIRESHARK_LOG_LEVEL

This environment variable controls the verbosity of diagnostic
messages to the console. From less verbose to most verbose levels
can be critical, warning, message, info, debug or noisy. Levels
above the current level are also active. Levels critical and
error are always active.

WIRESHARK_LOG_FATAL

Sets the fatal log level. Fatal log levels cause the program to
abort. This level can be set to Error, critical or warning.
Error is always fatal and is the default.

WIRESHARK_LOG_DOMAINS

This environment variable selects which log domains are active.
The filter is given as a case-insensitive comma separated list.
If set only the included domains will be enabled. The default
domain is always considered to be enabled. Domain filter lists
can be preceded by '!' to invert the sense of the match.

WIRESHARK_LOG_DEBUG

List of domains with debug log level. This sets the level of the
provided log domains and takes precedence over the active domains
filter. If preceded by '!' this disables the debug level instead.

WIRESHARK_LOG_NOISY

Same as above but for noisy log level instead.

SEE ALSO

wireshark-filter(4), wireshark(1), editcap(1), pcap(3), dumpcap(1),
text2pcap(1), mergecap(1), pcap-filter(7) or tcpdump(8)

NOTES

This is the manual page for TShark 3.6.22. TShark is part of the
Wireshark distribution. The latest version of Wireshark can be found
at <https://www.wireshark.org>.

HTML versions of the Wireshark project man pages are available at
<https://www.wireshark.org/docs/man-pages>.

AUTHORS

TShark uses the same packet dissection code that Wireshark does, as
well as using many other modules from Wireshark; see the list of
authors in the Wireshark man page for a list of authors of that code.

2024-03-27 TSHARK(1)