Source : Free On-Line Dictionary of Computing

Z shell
     
        (zsh) 1. {sh} with list processing and {database}
        enhancements.
     
        Version 2.1.o (before 1995-10-30).
     
        {(ftp://cs.ucsd.edu/pub/zsh/zsh2.1.0.tar.Z)}.
     
        2. A {Unix} command interpreter {shell} by Paul Falstad
         some time before 1993-03-23.  It is similar
        to, but not completely compatible with, {ksh}, with many
        additions to please {csh} users and some {tcsh} features.  zsh
        supports editing of multi-line commands in a single buffer;
        variable editing; a command buffer stack; {recursive}
        {glob}bing; manipulation of {arrays}; and spelling correction.
     
        zsh uses {GNU} {autoconf} so should compile and run on any
        modern version of UNIX, and many not-so-modern.
     
        Current version: 4.0.6, as of 2002-10-02.
     
        {zsh home (http://www.zsh.org/)}.
     
        (1995-10-31)