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-.PU
-.TH COMPRESS 1 local
-.SH NAME
-compress, uncompress, zcat \- compress and expand data
-.SH SYNOPSIS
-.ll +8
-.B compress
-[
-.B \-f
-] [
-.B \-v
-] [
-.B \-c
-] [
-.B \-V
-] [
-.B \-b
-.I bits
-] [
-.I "name \&..."
-]
-.ll -8
-.br
-.B uncompress
-[
-.B \-f
-] [
-.B \-v
-] [
-.B \-c
-] [
-.B \-V
-] [
-.I "name \&..."
-]
-.br
-.B zcat
-[
-.B \-V
-] [
-.I "name \&..."
-]
-.SH DESCRIPTION
-.I Compress
-reduces the size of the named files using adaptive Lempel-Ziv coding.
-Whenever possible,
-each file is replaced by one with the extension
-.B "\&.Z,"
-while keeping the same ownership modes, access and modification times.
-If no files are specified, the standard input is compressed to the
-standard output.
-Compressed files can be restored to their original form using
-.I uncompress
-or
-.I zcat.
-.PP
-The
-.B \-f
-option will force compression of
-.I name.
-This is useful for compressing an entire directory,
-even if some of the files do not actually shrink.
-If
-.B \-f
-is not given and
-.I compress
-is run in the foreground,
-the user is prompted as to whether an existing file should be overwritten.
-.PP
-The
-.B \-c
-option makes
-.I compress/uncompress
-write to the standard output; no files are changed.
-The nondestructive behavior of
-.I zcat
-is identical to that of
-.I uncompress
-.B \-c.
-.PP
-.I Compress
-uses the modified Lempel-Ziv algorithm popularized in
-"A Technique for High Performance Data Compression",
-Terry A. Welch,
-.I "IEEE Computer,"
-vol. 17, no. 6 (June 1984), pp. 8-19.
-Common substrings in the file are first replaced by 9-bit codes 257 and up.
-When code 512 is reached, the algorithm switches to 10-bit codes and
-continues to use more bits until the
-limit specified by the
-.B \-b
-flag is reached (default 16).
-.I Bits
-must be between 9 and 16.  The default can be changed in the source to allow
-.I compress
-to be run on a smaller machine.
-.PP
-After the
-.I bits
-limit is attained,
-.I compress
-periodically checks the compression ratio.  If it is increasing,
-.I compress
-continues to use the existing code dictionary.  However,
-if the compression ratio decreases,
-.I compress
-discards the table of substrings and rebuilds it from scratch.  This allows
-the algorithm to adapt to the next "block" of the file.
-.PP
-Note that the
-.B \-b
-flag is omitted for
-.I uncompress,
-since the 
-.I bits
-parameter specified during compression
-is encoded within the output, along with
-a magic number to ensure that neither decompression of random data nor
-recompression of compressed data is attempted. 
-.PP
-.ne 8
-The amount of compression obtained depends on the size of the
-input, the number of
-.I bits
-per code, and the distribution of common substrings.
-Typically, text such as source code or English
-is reduced by 50\-60%.
-Compression is generally much better than that achieved by
-Huffman coding (as used in
-.IR pack ),
-or adaptive Huffman coding
-.RI ( compact ),
-and takes less time to compute.
-.PP
-Under the
-.B \-v
-option,
-a message is printed yielding the percentage of
-reduction for each file compressed.
-.PP
-If the
-.B \-V
-option is specified, the current version and compile options are printed on
-stderr.
-.PP
-Exit status is normally 0;
-if the last file is larger after (attempted) compression, the status is 2;
-if an error occurs, exit status is 1.
-.SH "SEE ALSO"
-pack(1), compact(1)
-.SH "DIAGNOSTICS"
-Usage: compress [\-dfvcV] [\-b maxbits] [file ...]
-.in +8
-Invalid options were specified on the command line.
-.in -8
-Missing maxbits
-.in +8
-Maxbits must follow
-.BR \-b \.
-.in -8
-.IR file :
-not in compressed format
-.in +8
-The file specified to
-.I uncompress
-has not been compressed.
-.in -8
-.IR file :
-compressed with 
-.I xx
-bits, can only handle 
-.I yy
-bits
-.in +8
-.I File
-was compressed by a program that could deal with
-more 
-.I bits
-than the compress code on this machine.
-Recompress the file with smaller
-.IR bits \.
-.in -8
-.IR file :
-already has .Z suffix -- no change
-.in +8
-The file is assumed to be already compressed.
-Rename the file and try again.
-.in -8
-.IR file :
-filename too long to tack on .Z
-.in +8
-The file cannot be compressed because its name is longer than
-12 characters.
-Rename and try again.
-This message does not occur on BSD systems.
-.in -8
-.I file
-already exists; do you wish to overwrite (y or n)?
-.in +8
-Respond "y" if you want the output file to be replaced; "n" if not.
-.in -8
-uncompress: corrupt input
-.in +8
-A SIGSEGV violation was detected which usually means that the input file has
-been corrupted.
-.in -8
-Compression: 
-.I "xx.xx%"
-.in +8
-Percentage of the input saved by compression.
-(Relevant only for
-.BR \-v \.)
-.in -8
--- not a regular file: unchanged
-.in +8
-When the input file is not a regular file,
-(e.g. a directory), it is
-left unaltered.
-.in -8
--- has 
-.I xx 
-other links: unchanged
-.in +8
-The input file has links; it is left unchanged.  See
-.IR ln "(1)"
-for more information.
-.in -8
--- file unchanged
-.in +8
-No savings is achieved by
-compression.  The input remains virgin.
-.in -8
-.SH "BUGS"
-Although compressed files are compatible between machines with large memory,
-.BR \-b \12
-should be used for file transfer to architectures with 
-a small process data space (64KB or less, as exhibited by the DEC PDP
-series, the Intel 80286, etc.)