sleep is a Unix command line program that suspends program execution for a specified time. The sleep instruction suspends the calling process for at least the specified number of seconds (the default), minutes, hours or days.
Video Sleep (Unix)
Usage
Where number is an integer number to indicate the time period in seconds. Some implementations support floating point numbers.
Options
None.
Maps Sleep (Unix)
Examples
Causes the current terminal session to wait 30 seconds.
Causes the current terminal session to wait 5 hours
GNU sleep specific Examples
Wait 3 hours then play foo.mp3
Note that sleep 5h30m and sleep 5h 30m are illegal since sleep takes only one valueand unit as argument. However, sleep 5.5h (a floating point) is allowed. Consecutive executions of sleep can also be used.
Sleep 5 hours, then sleep another 30 minutes .
The GNU Project's implementation of sleep (part of coreutils) allows the user to pass an arbitrary floating point or multiple arguments, therefore sleep 5h 30m (a space separating hours and minutes is needed) will work on any system which uses GNU sleep, including Linux.
Possible uses for sleep include scheduling tasks and delaying execution to allow a process to start, or waiting until a shared network connection most likely has few users to wget a large file.
See also
- Sleep (operating system)
References
External links
sleep- Commands & Utilities Reference, The Single UNIX Specification, Issue 7 from The Open Group
Source of article : Wikipedia
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