Crontab

To edit the jobs use:

crontab -e

To view all jobs by user:

crontab -l -u {username}

This is an example of the sytax.

*/5 * * * *  /home/user/test.pl

This is the time coding.

.---------------- minute (0 - 59) 
|  .------------- hour (0 - 23)
|  |  .---------- day of month (1 - 31)
|  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ... 
|  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7)  OR sun,mon,tue,wed,thu,fri,sat 
|  |  |  |  |
*  *  *  *  *  command to be executed

Slash example: the following will run the script /home/user/test.pl every 5 minutes.

*/5 * * * *  /home/user/test.pl

Crontab jobs will start in / directory, make sure to cd in your first line of the bash script.

Environment Variables

If you want to include environment variables in the cronjob. You can add them to the top of the cron timing script.

Example

 TARGET_DIR=/home/site/public_html
 
 */5 * * * * deploy.sh >> log.log