man1has - User Commands

csh(1has): csh - shell command interpreter with a C-like syntax
ctags(1has): ctags - create a tags file for use with ex and vi
edit(1has): edit - text editor (variant of ex for casual users)
ex(1has): ex - text editor
sh(1has): sh, jsh - standard and job control shell and command interpreter
vi(1has): vi, view, vedit - screen-oriented (visual) display editor based on ex