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Full Discussion: Sleep command
Top Forums Shell Programming and Scripting Sleep command Post 302566731 by mandlysreedhar on Friday 21st of October 2011 03:16:33 AM
Old 10-21-2011
Sleep command
Hi All,

i am very new to shall script . i am not that much aware of sleep command ,
i want to terminate the sleep command after certain time.
following is my code.

Code:
while [ "$messag" ! ="P" ]
loop
sleep 1800
messag=/status.sql
done

the script will be on sleep untill the messag be comes P. here my requirement is . if the sleep function goes beyond 8 hours.. i want to come out from the sleep mode and i want to exit from the rest of the script.

for that i have written if statement. but.. is there any command with terminates the sleep mode after certain time.

Code:
while [ "$messag" != "P" ]
loop
 if [ $count -ge 10 ]
 then 
 exit 0;
    else 
  sleep 1800
messag=/status.sql
count=$[$count+1]
done

but my logic is wrong.. pls any one help me out from this problem


Thanks
Sree
Last edited by zxmaus; 10-21-2011 at 04:39 AM.. Reason: added code tags
 

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LEARN ABOUT CENTOS

sleep

SLEEP(3)						     Linux Programmer's Manual							  SLEEP(3)

NAME

       sleep - sleep for the specified number of seconds

SYNOPSIS

       #include <unistd.h>

       unsigned int sleep(unsigned int seconds);

DESCRIPTION

       sleep() makes the calling thread sleep until seconds seconds have elapsed or 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.

CONFORMING TO

       POSIX.1-2001.

BUGS

       sleep() may be implemented using SIGALRM; 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

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

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2010-02-03								  SLEEP(3)
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