Ah, ed. I have fond memories of being stuck in an ed command line inside the Unix mode of Z/OS on a mainframe.

  exit
  ?
  quit
  ?
  q
  ?
  bye
  ?
  help
  ?
  ohmygodgetmeouttaheeeeere
  ?

P.S. I'm not a native English speaker. "Fond" means "a vision of hell" right?