Source : Webster's Revised Unabridged Dictionary (1913)

Shebang \She*bang"\, n. [Cf. {Shebeen}.]
   A jocosely depreciative name for a dwelling or shop.
   [Slang,U.S.]

Source : WordNet®

shebang
     n : an entire system; used in the phrase `the whole shebang'

Source : Free On-Line Dictionary of Computing

shebang
     
         (Or "shebang line", "{bang path}")
        /sh*-bang'/ (From "{sharp}" and "{bang}") The {magic cookie}
        "#!" used in {Unix} to mark the start of a {script}, e.g. a
        {shell script} or {Perl script}.
     
        Under {Unix}, if the first two bytes of an {executable} file
        are "#!", the {kernel} treats the file as a script rather than
        a {machine code} program.  The word following the "!" (i.e.,
        everything up to the first {whitespace}) is used as the
        {pathname} of the {interpreter}.  For example, if the first
        line of an executable is
     
         #!/usr/local/bin/perl
     
        the script will be treated as a {Perl} script and passed as an
        argument to /usr/local/bin/perl to be interpreted.  Some
        variants of Unix also allow one or more parameters to be
        passed to the interpreter, for example, you can write
     
         #!/usr/bin/perl -w
     
        and the script will be started as if you typed
     
         /usr/bin/perl -w 
     
        on the command line.  Also, most modern kernels ignore any
        whitespace between the "!" and the interpreter pathname.  Even
        some modern kernels have fairly small limits (e.g. 32) on the
        length of line they will accept, making long pathnames and
        arguments somewhat unportable.
     
        [Does anyone call this a "magic string"?]
     
        (1998-05-06)