sleep(1) General Commands Manual sleep(1)NAME
sleep - suspend execution for an interval
SYNOPSIS
time
DESCRIPTION
suspends execution for time seconds. It is used to execute a command after a certain amount of time, as in:
or to execute a command periodically, as in:
command
RETURN VALUE
exits with one of the following values:
0 The execution was successfully suspended for time seconds, or a SIGALRM signal was received.
>0 If the time operand is missing, is not a decimal integer, is negative, or is greater than returns with exit status 2.
SEE ALSO alarm(2), sleep(3C).
STANDARDS CONFORMANCE sleep(1)
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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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