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how to cancel a cronjob if the cronjob still running

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# 1  
how to cancel a cronjob if the cronjob still running

hi everyone I'm newbie in this forum hope I can get some help here Smilie

I have a command in crontab that executed every 1 minute
sometime this command need more than 1 minute to finish
the problem is, the crontab execute this command although it's not finish processing yet and causing the system hang

is there any way that can set the crontab to not execute the command if it's not finish yet?

thanks before for your help Smilie
# 2  
One way I can think of is to put a check on the script that runs as a part of crontab. Whatever you want to do with the script you do after a check that if any command of similar name is still running. example: lets say if you are running /home/user/ every one minute, then add a check
ps -ef | grep "" | grep -v grep

on your in the beginning

# 3  
check for the process before running your command in the script

write a pid file, or grep for the process

ps -ef |  grep processname | grep -v grep || yourcommand

or something like that

Last edited by funksen; 08-18-2010 at 06:44 AM..
# 4  
ok this my command in the crontab:
*/1 * * * * /usr/bin/php /var/www/xml_updater.php

now, where should I put the grep command that you guys mentioned above?
# 5  
you write a script, from within the script you run your php command, and before that, you place the grep command

ps -ef |  grep  "[x]ml_updater.php"  || /usr/bin/php /var/www/xml_updater.php

# 6  
Originally Posted by funksen
you write a script, from within the script you run your php command, and before that, you place the grep command

ps -ef |  grep  "[x]ml_updater.php"  || /usr/bin/php /var/www/xml_updater.php

hi Funk, thanks before for your help
I want to know what is exactly the code you give above do?
# 7  
if returncode of grep is greater than zero, eq the process has not been found, execute your script (||)

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