tcsh (l `tee-cee-shell`, l `tee-shell`, or as an acronym `tee cee ess aitch`) is a Unix shell based on and compatible with the C shell (csh). It is essentially the C shell with programmable command-line completion, command-line editing, and a few other features. ==History== The `t” in tcsh comes from the `T” in TENEX, an operating sy... Found on http://en.wikipedia.org/wiki/Tcsh