ncurses: emacs. cli: cd, ls, mv, rm, grep, …, i.e., the core utils, + git, svn. I couldn't live without the core utils, and I use them a lot as I don't have a

ncurses: emacs. cli: cd, ls, mv, rm, grep, …, i.e., the core utils, + git, svn. I couldn't live without the core utils, and I use them a lot as I don't have a graphical file manager (I think the last time I used one was in 2007, I might try again someday). Also, I don't know if it counts in either category but: ssh, of course.