HP UX Operating Systems 139

compress(1)

uncompress: corrupt input

A SIGSEGV violation was detected which usually means that the input ®le has been corrupted.

Compression: xx.xx%

Percentage of the input saved by compression. (Relevant only for -v.)

-- not a regular file: unchanged

When the input ®le is not a regular ®le (a directory for example), it is left unaltered.

-- has xxother links: unchanged

The input ®le has links which are not symbolic links and has been left unchanged. See ln(1) for more information.

-- has symbolic links: unchanged

The input ®le has symbolic links and has been left unchanged. See ln(1) for more information.

-- file unchanged

No savings is achieved by compression. The input remains unaltered.

EXAMPLES

Compress the ®le named zenith and print compression information to the terminal:

compress -v zenith

The terminal display shows either a line resembling

zenith: Compression: 23.55% -- replaced with zenith.Z

indicating that the compressed ®le is 23.55% smaller than the original, or a line resembling

zenith: Compression: -12.04% -- file unchanged

indicating that an additional 12.04% space must be used to compress the ®le.

Undo the compression by typing either of the following commands:

uncompress zenith.Z compress -d zenith.Z

This restores ®le zenith.Z to its original uncompressed form and name.

uncompress will perform on standard input if no ®les are speci®ed. For example, to list a compressed tar ®le:

uncompress -c arch.tar.Z tar -tvf -

WARNINGS

Although compressed ®les are compatible between machines with large memory, -b12 should be used for ®le transfer to architectures with a small process data space (64K bytes or less).

NFS

Access control lists of networked ®les are summarized (as returned in st_mode by stat(), but not copied to the new ®le (see stat(2)).

AUTHOR

compress was developed by Joseph M. Orost, Kenneth E. Turkowski, Spencer W. Thomas, and James A. Woods.

FILES

*.Z Compressed ®le created by compress and removed by uncompress.