09-24-2011
Yes in some ways they are the same functionality they intend to compress data.
Some do better than others e.g gzip is better than compress and pack in overall .
compress and gzip are alike in some ways as they are exploit the same algorithm but they differ in some ways.
compress : The compress utility will attempt to reduce the size of the named files by using adaptive Lempel-Ziv coding. 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 pack ).
pack : The pack command attempts to store the specified files in a compressed form. Wherever possible (and useful), each input file file is replaced by a packed file file.z with the same access modes, access and modified dates, and owner as those of file. If pack is successful, file will be removed.
gzip Is a GNU version of Lempel-Ziv coding (LZ77) which reduces the size of the named files using Lempel-Ziv coding (LZ77). Whenever possible, each file is replaced by one with the extension ‘.gz’, while keeping the same ownership modes, access and modification times.
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LEARN ABOUT SUNOS
mkcover
MKCOVER(8) System Manager's Manual MKCOVER(8)
NAME
mkcover - HylaFAX continuation cover page generation command
SYNOPSIS
/var/spool/hylafax/bin/mkcover qfile template result
DESCRIPTION
bin/mkcover is the command invoked by the facsimile server when a continuation cover page is required for an outbound job that is about to
be retried. It generates a single POSTSCRIPT(R) page that is imaged according to the remote capabilities and transmitted as the cover
page. The arguments are:
qfile the job description file for the outbound job.
template the cover page template file, as used by the faxcover(1) program.
result the filename where the resultant POSTSCRIPT document should be written.
The default mkcover command is a shell script that uses awk(1) to parse the job description file and generate the cover page document. The
template file may be optionally compressed with compress(1), pack(1), or gzip(1); the filename suffix is used to decide whether or not the
template file contains compressed data.
SEE ALSO
faxq(8), hylafax-config(5), sendq(5)
June 20, 1994 MKCOVER(8)