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OpenDarwin 7.2.1 - man page for sleep (opendarwin section 1)

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SLEEP(1)			   BSD General Commands Manual				 SLEEP(1)

NAME
     sleep -- suspend execution for an interval of time

SYNOPSIS
     sleep seconds

DESCRIPTION
     The sleep command suspends execution for a minimum of seconds.

     If the sleep command receives a signal, it takes the standard action.

IMPLEMENTATION NOTES
     The SIGALRM signal is not handled specially by this implementation.

     The sleep command will accept and honor a non-integer number of specified seconds (with a
     '.' character as a decimal point).  This is a non-portable extension, and its use will
     nearly guarantee that a shell script will not execute properly on another system.

EXAMPLES
     To schedule the execution of a command for x number seconds later (with csh(1)):

	   (sleep 1800; sh command_file >& errors)&

     This incantation would wait a half hour before running the script command_file.  (See the
     at(1) utility.)

     To reiteratively run a command (with the csh(1)):

	   while (1)
		   if (! -r zzz.rawdata) then
			   sleep 300
		   else
			   foreach i (`ls *.rawdata`)
				   sleep 70
				   awk -f collapse_data $i >> results
			   end
			   break
		   endif
	   end

     The scenario for a script such as this might be: a program currently running is taking
     longer than expected to process a series of files, and it would be nice to have another pro-
     gram start processing the files created by the first program as soon as it is finished (when
     zzz.rawdata is created).  The script checks every five minutes for the file zzz.rawdata,
     when the file is found, then another portion processing is done courteously by sleeping for
     70 seconds in between each awk job.

DIAGNOSTICS
     The sleep utility exits 0 on success, and >0 if an error occurs.

SEE ALSO
     nanosleep(2), sleep(3)

STANDARDS
     The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

HISTORY
     A sleep command appeared in Version 4 AT&T UNIX.

BSD					  April 18, 1994				      BSD
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