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Command: sleep | Section: 1 | Source: OpenBSD | File: sleep.1
SLEEP(1) FreeBSD General Commands Manual SLEEP(1)
NAME
sleep - suspend execution for an interval of time
SYNOPSIS
sleep seconds
DESCRIPTION
The sleep utility suspends execution for at least the given number of
seconds. seconds must be a non-negative decimal value and may contain a
fraction.
ASYNCHRONOUS EVENTS
SIGALRM Terminate early, with a zero exit status.
EXIT STATUS
The sleep utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
Wait five seconds before running a command:
$ sleep 5; echo Hello, World!
List a file twice per second:
while ls -l file; do
sleep 0.5
done
SEE ALSO
at(1)
STANDARDS
The sleep utility is compliant with the IEEE Std 1003.1-2008 ("POSIX.1")
specification.
Support for fractional seconds is an extension to that specification.
HISTORY
A sleep utility first appeared in Version 4 AT&T UNIX.
This implementation of sleep first appeared in 4.3BSD-Tahoe.
FreeBSD 14.1-RELEASE-p8 July 30, 2022 FreeBSD 14.1-RELEASE-p8