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sharchive
(foldoc) | shar
sharchive
shar file
("Shell archive", after ar and tar)
Any of the many Unix programs that creates a flattened
representation of one or more files, with the unique property
that it can be unflattened (the original files extracted)
merely by feeding it through a standard Unix shell. The
output of shar, known as a "shar file" or "sharchive", can be
distributed to anyone running Unix, and no special unpacking
software is required.
Sharchives are intriguing in that they are typically created
by shell scripts; the script that produces sharchives is thus
a script which produces self-unpacking scripts, which may
themselves contain scripts. The disadvantage of sharchives
are that they are an ideal venue for Trojan horse attacks
and that, for recipients not running Unix, no simple
un-sharchiving program is possible; sharchives can and do make
use of arbitrarily-powerful shell features and other Unix
commands.
Different implementations of shar vary in sophistication.
Some just uuencode each input file and output commands to
uudecode the result, others include extensive checking to
make sure the files have been transferred without corruption
and that all parts of a multi-file sharchive have been
unpacked.
The unshar utility strips off mail and news headers before
passing the remainder of its input to sh.
(1996-10-18)
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sharchive
(jargon) | sharchive
/shar´ki:v/, n.
[Unix and Usenet; from /bin/sh archive] A flattened representation of a
set of one or more files, with the unique property that it can be
unflattened (the original files restored) by feeding it through a standard
Unix shell; thus, a sharchive can be distributed to anyone running Unix,
and no special unpacking software is required. Sharchives are also
intriguing in that they are typically created by shell scripts; the script
that produces sharchives is thus a script which produces self-unpacking
scripts, which may themselves contain scripts. Sharchives are also commonly
referred to as ‘shar files’ after the name of the most common program for
generating them.
The downsides of sharchives are that they are an ideal venue for {Trojan
horse} attacks and that, for recipients not running Unix, no simple
un-sharchiving program is possible; sharchives can and do make use of
arbitrarily-powerful shell features. For these reasons, this technique has
largely fallen out of use since the mid-1990s.
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