Hi,
I want to run my shrip for every 30 min..
if i enter crontab -l i am getting following..

00,10,20,30,40,50 * * * * /home/arbuser/temp2/perform/per.sh
00,15,40,35,50 * * * * sh home/arbuser/temp2/perform/per.sh

if I enter like this :

ps -ef |grep cron
root 311454 1 0 Jun 11 - 0:03 /usr/sbin/cron
arbuser 426042 1634480 0 15:12:13 pts/3 0:00 grep cron


but my per.sh is not running..any idea?

Why would you expect it be running at any instant? It is started by cron at the instants specified. For how long it stays? Depends. Only you know. Or it errored out.

BTW, the crontab does not seem to be consistent with what you said "for every 30 min". Double chk. Tom

Try this

30 * * * * < script name >


This will run ur script every 30 mins.

No it won't, that will run the script at 30 minuts past each hour.

0,30 * * * * < script name >
will run the script every 30 minutes, although I personally would use something more like

7,37 * * * * < script name >