Unix. Tcsh started as a fork of csh, adding filename completion. https://en.wikipedia.org/wiki/Tcsh https://en.wikipedia.org/wiki/Tcsh See https://en.wikipedi

Unix. Tcsh started as a fork of csh, adding filename completion. https://en.wikipedia.org/wiki/Tcsh https://en.wikipedia.org/wiki/Tcsh See https://en.wikipedia.org/wiki/C_shell https://en.wikipedia.org/wiki/C_shell for why csh was popular over the Bourne shell of that era. Why do you ask? Is it a trick question in that it has influences from TENEX?