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Full Discussion: sleep command
Top Forums Shell Programming and Scripting sleep command Post 302463776 by DGPickett on Monday 18th of October 2010 11:41:41 AM
Old 10-18-2010
Sleep is very low overhead, as it sets up for SIGALARM and is utterly inactive until it expires. Of course, some people get antsy about comatose app's and sleep for less time many times, perhaps logging their progress toward a calculated stop time.

You probably cannot sleep past 2038, when the UNIX clock turns over to the sign bit.
 

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sleep(3C)																 sleep(3C)

NAME
sleep() - suspend execution for interval SYNOPSIS
DESCRIPTION
suspends the current process from execution for the number of seconds specified by the argument. Actual suspension time can be less than that requested for two reasons: o Scheduled wakeups occur at fixed 1 second intervals (on the second, according to an internal clock), and o Any caught signal terminates the sleep following execution of that signal's catching routine. Suspension time can be an arbitrary amount longer than requested due to the scheduling of other activity in the system. The value returned by is the "unslept" amount (the requested time minus the time actually slept) in case the caller had an alarm set to go off earlier than the end of the requested time, or premature arousal due to another caught signal. seconds must be less than 2^31. APPLICATION USAGE
If a is generated for a multithreaded process, it may not be delivered to a thread currently in See the sigwait(2) manpage for details. SEE ALSO
sigwait(2), signal(5), thread_safety(5). STANDARDS CONFORMANCE
sleep(3C)
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