124: How do I produce C-XXX with my keyboard?

  On terminals (but not under X), some common "aliases" are:

            C-2  or  C-SPC         for      C-@
            C-6                    for      C-^
            C-7  or  C-S--         for      C-_
            C-4                    for      C-\
            C-5                    for      C-]
            C-/                    for      C-?

  Often other aliases exist; use the "C-h c" command and try `CTRL' with
  all of the digits on your keyboard to see what gets generated.  You can
  also try the "C-h w" command if you know the name of the command.