* break [ n ]
           Exit from the enclosed for, while,  until,  or  select
           loop,  if any.  If n is specified then break n levels.
           If n is greater than the number  of  enclosing  loops,
           the outermost enclosing loop shall be exited.

     * continue [ n ]
           Resume the next iteration of the enclosed for,  while,
           until,  or  select loop. If n is specified then resume
           at the n-th enclosed loop. If n is  greater  than  the
           number  of  enclosing  loops,  the outermost enclosing
           loop shall be used.

     * return [ n ]
           Causes a shell function or '.' script to return to the
           invoking script with the return status specified by n.
           The value will be the least significant 8 bits of  the
           specified  status.  If  n  is  omitted then the return
           status is that of the last command executed. If return
           is  invoked  while  not in a function or a '.' script,
           then it is the same as an exit.

     * exit [ n ]
           Causes the calling shell or shell script to exit  with
           the  exit status specified by n. The value will be the
           least significant 8 bits of the specified status. If n
           is  omitted  then  the exit status is that of the last
           command executed. When exit occurs  when  executing  a
           trap, the last command refers to the command that exe-
           cuted before the trap was invoked. An  EOF  will  also
           cause  the  shell to exit except for a shell which has
           the ignoreeof option (See set below) turned on.