Good answer to an excellent question. But I do not agree. POSIX is the whole of a lot of utilities. Most of these utilities I never use, and there is a lot o

Good answer to an excellent question. But I do not agree. POSIX is the whole of a lot of utilities. Most of these utilities I never use, and there is a lot of utilities not part of POSIX that I would consider part of the "command line experience" (editor, tmux, some home grown tools, a REPL or debugger, ...), ssh, ... Sometimes I refer to shell programs, or shell environments. This adapts to all that I actually use quite flexibly. Both to the tools, and with a special attention to the glue: the POSIX, Ba-, Da-, Z sh. Interchageably, I also happen to use TTY (pronounced as Tee Tee Why ;) ), terminal, and Console . I am not particularly happy with any of these, and also do not have a strong preference. I would like to be more consistent in my wording, so opiniated replies are most welcome :)