|SLEEP(1P)||POSIX Programmer's Manual||SLEEP(1P)|
- A non-negative decimal integer specifying the number of seconds for which to suspend execution.
- Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of POSIX.1‐2008, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.)
- If set to a non-empty string value, override the values of all the other internationalization variables.
- Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments).
Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.
- Determine the location of message catalogs for the processing of LC_MESSAGES.
- Terminate normally with a zero exit status.
- Effectively ignore the signal.
- Provide the default behavior for signals described in the ASYNCHRONOUS EVENTS section of Section 1.4, Utility Description Defaults. This could include terminating with a non-zero exit status.
The sleep utility shall take the standard action for all other signals.
- The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received. See the ASYNCHRONOUS EVENTS section.
- An error occurred.
The following sections are informative.
(sleep 105; command) &
or to execute a command every so often, as in:
while true do command sleep 37 done
As with all other utilities that take integral operands and do not specify subranges of allowed values, sleep is required by this volume of POSIX.1‐2008 to deal with time requests of up to 2147483647 seconds. This may mean that some implementations have to make multiple calls to the delay mechanism of the underlying operating system if its argument range is less than this.
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment Variables
The System Interfaces volume of POSIX.1‐2008, alarm(), sleep()
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|2013||IEEE/The Open Group|