\/ ! - R U N   A   S H E L L   C O M M A N D \/

 Executes the rest of the command line as a shell command.
 Parameters: none. The rest of the line is read as raw text.
 Notes
 - Unary "!" pops an interactive shell
 - Q implements the "cd" command internally
 - As with other Q commands, "cd" is case-insensitive (but the path name for CD
is not).
