exec:  Execute a command

Usage:  exec [-CtTh-] [<command>]

   exec will run an arbitrary command.

Options:

   -C            Start up a copy of C shell to run each command.
   -t            Trace mode.  Each generated command line is
                 written to stderr just prior to invocation.
   -T            Change the title bar when starting the child.

   -h            Help.  (This screen.)
   --            End of options.