I used to play a ‘command line game’ that was written in FORTRAN and ran on a DEC PDP 11/70. This was back in the 1980’s by the way.
It was called DUNGEON (yes, Dungeons and Dragons). You didn’t need special ‘commands’. You simply typed in , in standard English, what you wanted to do. It was amazingly accurate in ‘interpreting’ what you wanted done. It was even good at telling you when you were asking for idiotic things.
I think my favorite command line game was Hugo’s House of Horrors back in 1990. It was shareware and the author wrote three games in the series.
The whole family liked it so much I paid the author’s registration fee and got the registered versions.