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problem with sleep cmd in execution of cron...

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# 1  
Old 01-31-2012
problem with sleep cmd in execution of cron...
I am scheduling a task at regular intervals at seconds acuracy using crond and sleep command . my data in crontab file is as below:-

Quote:
05 00 * * 0,4,5,6, sleep 45 && /usr/local/bin/set_radio_cron grp0 0 0 &
the above line is working fine when we are creating this crontab file before 00:05 min .
But when we are creating the crontab file at 00:05min , unable to execute sleep cmd. But the next cmd "/usr/local/bin/set_radio_cron grp0 0 0" is able to execute.

please guide me in this. what may be the problem? where i have to modify to make it work?
[as frm 00:05:00 to 00:05:59 has 1min duration and if i create the crontab file between this duration what will be the significance?]
Thanks in advance..
# 2  
Old 01-31-2012
What do you mean "unable to execute the sleep cmd"? What does it actually do?
# 3  
Old 01-31-2012
I mean that when the crontab file is created at 00:05:00 and executed at the same time. the " sleep 45 " command is not running and directly the second command is running. i.e "/usr/local/bin/set_radio_cron grp0 00 & "

I think now it is clear.
# 4  
Old 01-31-2012
Quote:
[as frm 00:05:00 to 00:05:59 has 1min duration and if i create the crontab file between this duration what will be the significance?]
The significance is that the next time cron will look at the line you changed will be tomorrow at 00:05. To be safe you really needed to complete the change to crontab by 00:04 .


Quote:
05 00 * * 0,4,5,6, sleep 45 && /usr/local/bin/set_radio_cron grp0 0 0 &
The highlighted comma and ampersand are neither needed nor desirable.
Last edited by methyl; 01-31-2012 at 01:22 PM..
# 5  
Old 02-01-2012
@ above

But actually when i am creating the crontab file in-between 00:05:00 to 00:05:59 the second command is being executed but the 1st command i.e sleep 45 is not running.
# 6  
Old 02-01-2012
Quote:
Originally Posted by manoj424
@ above

But actually when i am creating the crontab file in-between 00:05:00 to 00:05:59 the second command is being executed but the 1st command i.e sleep 45 is not running.
I hope you have removed &

Secondly, are you sure that Sleep command did not get executed?
# 7  
Old 02-01-2012
Quote:
I hope you have removed &
I didn' t get u.
where I have to keep "&" .
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