Shar definition

Shar





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From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

  shar
       
           ("Shell archive", after {ar} and {tar})
          Any of the many {Unix} programs that creates a {flatten}ed
          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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