sleep - sleep for a while


<sleep $seconds [wake]>

The sleep function pauses (sleeps) for $seconds seconds (for each value of $seconds).

sleep returns the number of seconds remaining to be slept (a float), which is normally 0. However, if the "wake" argument is given, sleep may wake up early and return a non-zero value, if a signal was caught. (This can be used to wait for another process to signal the script and wake it up.)

The sleep function was added Sep. 17 1996. The wake flag was added Sep. 1 2000; previous versions behaved as if it were always set.

Sleep durations with fractions of a second may be given, e.g. 1.5. However, the actual sleep duration may vary depending on the platform's clock resolution.

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