Test your cron expression (examples)


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Cron is driven by a crontab (cron table) file, a configuration file that specifies shell commands to run periodically on a given schedule. On linux systems you can run the crontab -e command to edit.

Format

    # ┌───────────── minute (0 - 59)
    # │ ┌───────────── hour (0 - 23)
    # │ │ ┌───────────── day of month (1 - 31)
    # │ │ │ ┌───────────── month (1 - 12)
    # │ │ │ │ ┌───────────── day of week (0 - 6) (Sunday to Saturday;
    # │ │ │ │ │                                       7 is also Sunday on some systems)
    # │ │ │ │ │
    # │ │ │ │ │
    # * * * * *  command to execute

The syntax of each line expects a cron expression made of five fields, followed by a shell command to execute.

Examples

Expression Description 
*/5 * * * *
 Every 5 minutes show 
0 */8 * * *
 Every 8 hours show 
1,5 * * * *
 Minutes 1 and 5 of each hour show 
1-5 * * * *
 Minutes 1,2,3,4 and 5 of each hour show 
0 2 * * *
 Once a day at 2 am show 
0 1 * * 1,2
 Monday and Tuesday at 1 am every week show 
0 0 * * 1
 Every Monday at midnight show 
0 0 1 * *
 Day 1 of each month at midnight show 
0 0 */5 * *
 Every 5 days show

Cron Job Monitoring

Receive alerts if your cron jobs fail

How is it done? click here