Exec( command )
Exec executes the command given by the string command
in the operating system. How this happens is operating system dependent.
Under UNIX, for example, a new shell is started and command is
passed as a command to this shell.
gap> Exec( "date" );
Fri Dec 13 17:00:29 MET 1991
Edit (see Edit) should be used to call an editor from within
GAP.