FIOCOMPRESS(8) Maintenance Commands and Procedures FIOCOMPRESS(8)

NAME

fiocompress - file compression utility

SYNOPSIS

/sbin/fiocompress -c [-m] [-b block_size] input_file output_file


/sbin/fiocompress -d input_file output_file

DESCRIPTION

The fiocompress utility is a file compression tool that works
together with the dcfs(4FS) file system to perform per-file
compression. You can use fiocompress to decompress a compressed file
or mark a compressed file as compressed, causing automatic
decompression on read. The primary use of fiocompress is to compress
files in the boot archive.


Note that this utility is not a Committed interface. See
attributes(7).

OPTIONS

The following options are supported:

-b block_size

Specify a block size for compression. The default block size is
8192.


-c

Compress the specified file.


-d

Decompress the specified file.


-m

Mark the compressed file for automatic decompression on read. Can
be used only in conjunction with -c.

EXIT STATUS

0

The command completed successfully.


-1

The command exited due to an error.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Private |
+--------------------+-----------------+

SEE ALSO

dcfs(4FS), ufs(4FS), attributes(7), boot(8), bootadm(8)

NOTES

This compression/decompression utility works only with files stored
in a UFS file system.


There is no obvious way to determine whether a given file is
compressed, other than copying the file and comparing the number of
disk blocks of the copy against the original.

December 10, 2008 FIOCOMPRESS(8)