Sleep for a Specified Period

Usage:  sleep [-hm-] [ seconds ]

   Sleep the specified integer number of seconds (rounded to the next
   clock tick.)  Default is 1 second or until an interrupt occurs.

Options:

   -m   Sleep interval is in milliseconds rather than seconds.
   -h   Help.  (This screen.)
   --   End of options.

(The slash, "/", may be used instead of a minus to introduce
options.  To specify a different set of characters to introduce
options, use the SWITCHCHARS environmental variable.)