DF(1B) BSD Compatibility Package Commands DF(1B)

NAME

df - display status of disk space on file systems

SYNOPSIS

/usr/ucb/df [-a] [-i] [-t type] [filesystem...]
[filename...]

DESCRIPTION

The df utility displays the amount of disk space occupied by
currently mounted file systems, the amount of used and available
space, and how much of the file system's total capacity has been
used.


If arguments to df are path names, df produces a report on the file
system containing the named file. Thus `df .' shows the amount of
space on the file system containing the current directory.

OPTIONS

The following options are supported:

-a
Report on all filesystems including the uninteresting ones
which have zero total blocks (that is, auto-mounter).


-i
Report the number of used and free inodes. Print ` * ' if
no information is available.


-t type
Report on filesystems of a given type (for example, nfs or
ufs).

EXAMPLES

Example 1: Using df

A sample of output for df looks like:


example% df
Filesystem kbytes used avail capacity Mounted on
sparky:/ 7445 4714 1986 70% /
sparky:/usr 42277 35291 2758 93% /usr


Note that used+avail is less than the amount of space in the file
system (kbytes); this is because the system reserves a fraction of
the space in the file system to allow its file system allocation
routines to work well. The amount reserved is typically about 10%;
this can be adjusted using tunefs (see tunefs(8)). When all the space
on a file system except for this reserve is in use, only the super-
user can allocate new files and data blocks to existing files. When a
file system is overallocated in this way, df can report that the file
system is more than 100% utilized.

FILES

/etc/mnttab
List of file systems currently mounted


/etc/vfstab
List of default parameters for each file system

SEE ALSO

du(1), mnttab(5), attributes(7), quot(8), tunefs(8)

September 14, 1992 DF(1B)