root:~$ java hell0w0rld

In centos, if you dont want to use the default crontab you can create your own scheduler.

The options are

1. Create a crontab by crontab -e
2. Create your crontab in a file and put it in /etc/cron.d folder

I choosed option 2 because from my opinion, putting your crontab in a file is more manageable and looks more prettier. For example i can create multiple crontabs that run using multiple user level in the file instead of login to every user and create crontab for each user.

So i created a file called myCrontab and put

0-59 * * * * /home/myuser/test.sh > /home/myuser/test.log

This will execute test.sh every minute, and in test.sh i have

echo “Hell0W0rld at $(date)”

But nothing happened in the test.log.

When i tried to put 0-59 * * * * /home/myuser/test.sh > /home/myuser/test.log in my user crontab using crontab -e, it worked!

After googling, i found some advices like to remove blank line at above my scrpt if any, or chmod 644 myCrontab instead of chmod 755.

But still not worked, until i found in a forum that if you use /etc/cron.d folder you have to put your user in the crontab script.

So i changed myCrontab file to

0-59 * * * * root /home/myuser/test.sh > /home/myuser/test.log

and it works well !!!

Posted on Friday, July 9th, 2010 at 4:33 am in Uncategorized | rss feed for comments| Leave a response, or trackback