The Free On-line Dictionary of Computing (19 January 2023):

tcsh

    A Unix shell by Christos Zoulas
   , based on csh.  tcsh adds WYSIWYG
   command line editing, command name completion, input history
   and various other features.

   Version 6.04 runs under many versions of Unix and under
   OpenVMS.  tcsh has been largely replaced by bash.

   (ftp://ftp.spc.edu/).

   (2014-09-14)