How to set Cron on Linux?
Simple open the crontab on editor using following command:
| shell> crontab -e |
An editor usually vim would open. Now you can write your cron scripts that are to be schedulled there.
If I am setting cron for drupal, it would be something like
| 0 */1 * * * /usr/bin/wget -O - -q http://www.mysite.com/cron.php |
This means the script would run every hour.
If I want to run the script every 2 hours, it would be like this:
| 0 */2 * * *<script> |
If I want the script to execute every 30 minutes, cron would be:
| 30 * * * * <script> |
Thus, this means * * * * * stands for minutes(0-59), hour(0-23), day of month(1-31), month(1-12), day of week(0-7 values where 0 and 7 stands for Sun or names like sun) respectively.
Therefore, if I want to run the script daily at 10pm:
| 0 22 * * * <script> |
Thus,
0 0 1 1 * echo "Run once a year" 0 0 1 * * echo "Run once a month" 0 0 * * 0 echo "Run once a week" 0 0 * * * echo "Run once a day" 0 * * * * echo "Run once an hour" 0 22 * * 1-5 echo "run at 10 pm on weekdays" 5 4 * * sun echo "run at 5 after 4 every sunday" 5 0 * * * echo "run five minutes after midnight, every day" |
Thus, exit vim using standard :wq, your cron script is saved and your scripts would run as scheduled above.
Post Comment