ctrl

control
ctrl

   <character> (Or "ctrl", "^") One (or a pair) of {modifier
   keys} found on all modern {keyboards}.  If the control key is
   held down while pressing and releasing certain other keys then
   a "{control character}" is generated, e.g. holding control and
   hitting "A" generates control-A ({ASCII} code 1).  The ASCII
   code for the control character is generally 64 less than that
   for the unmodified character.

   The control key does not generate any character on its own but
   most modern keyboards and {operating systems} allow a program
   to tell whether each of the individual keys on the keyboard
   (including modifier keys) is pressed at any time.

   Control characters mostly have some kind of "non-printing"
   effect on the output such as ringing the bell (Control-G) or
   advancing to the next line (Control-J).  Most have alternative
   names suggesting these functions (Bell, Line Feed, etc.).

   See {ASCII character table}.

   (1997-07-10)