[MAN] sleep

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SLEEP

Section: User Commands (1)
Updated: January 2018
Index Return to Main Contents

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NAME

sleep - delay for a specified amount of time  

SYNOPSIS

sleep ,NUMBER/[,SUFFIX/]...
sleep ,OPTION/  

DESCRIPTION

Pause for NUMBER seconds. SUFFIX may be 's' for seconds (the default), 'm' for minutes, 'h' for hours or 'd' for days. Unlike most implementations that require NUMBER be an integer, here NUMBER may be an arbitrary floating point number. Given two or more arguments, pause for the amount of time specified by the sum of their values.

--help

display this help and exit

--version

output version information and exit

 

AUTHOR

Written by Jim Meyering and Paul Eggert.  

REPORTING BUGS

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report sleep translation bugs to <http://translationproject.org/team/>  

COPYRIGHT

Copyright © 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.  

SEE ALSO

sleep(3)

Full documentation at: <http://www.gnu.org/software/coreutils/sleep>
or available locally via: info '(coreutils) sleep invocation'

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Index

NAME

SYNOPSIS

DESCRIPTION

AUTHOR

REPORTING BUGS

COPYRIGHT

SEE ALSO

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SLEEP

Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
Index Return to Main Contents

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NAME

sleep - sleep for a specified number of seconds  

SYNOPSIS

#include <unistd.h>

unsigned int sleep(unsigned int seconds);

 

DESCRIPTION

sleep() causes the calling thread to sleep either until the number of real-time seconds specified in seconds have elapsed or until a signal arrives which is not ignored.  

RETURN VALUE

Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
sleep()	Thread safety	MT-Unsafe sig:SIGCHLD/linux

 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.  

NOTES

On Linux, sleep() is implemented via nanosleep(2). See the nanosleep(2) man page for a discussion of the clock used.  

Portability notes

On some systems, sleep() may be implemented using alarm(2) and SIGALRM (POSIX.1 permits this); mixing calls to alarm(2) and sleep() is a bad idea.

Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.  

SEE ALSO

sleep(1), alarm(2), nanosleep(2), signal(2), signal(7)  

COLOPHON

This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ATTRIBUTES

CONFORMING TO

NOTES

Portability notes

SEE ALSO

COLOPHON

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