Source : Free On-Line Dictionary of Computing

unshar
     
        A {Unix} utility that removes {e-mail} and {news} {header}
        lines from its input, and feeds the remainder (which is
        presumed to be a {shar file}) to /bin/sh to unpack it.  unshar
        is designed for unpacking archives directly from the news or
        mail systems simply by {piping} a message into it.