Cron Cheat Sheet

From WikiOD

Here is the cheatsheat of Cron and basic guide on how to use Cron

Format[edit | edit source]

{: .-two-column}

Format[edit | edit source]

Min  Hour Day  Mon  Weekday

{: .-setup}

*    *    *    *    *  command to be executed
┬    ┬    ┬    ┬    ┬
│    │    │    │    └─  Weekday  (0=Sun .. 6=Sat)
│    │    │    └──────  Month    (1..12)
│    │    └───────────  Day      (1..31)
│    └────────────────  Hour     (0..23)
└─────────────────────  Minute   (0..59)

{: .-setup.-box-chars}

Operators[edit | edit source]

Operator Description
* all values
, separate individual values
- a range of values
/ divide a value into steps

Examples[edit | edit source]

Example Description
0 * * * * every hour
*/15 * * * * every 15 mins
0 */2 * * * every 2 hours
0 18 * * 0-6 every week Mon-Sat at 6pm
10 2 * * 6,7 every Sat and Thu on 2:10am
0 0 * * 0 every Sunday midnight
@reboot every reboot

Crontab[edit | edit source]

# Adding tasks easily
echo "@reboot echo hi" | crontab
# Open in editor
crontab -e
# List tasks
crontab -l [-u user]

Credit:rstacruz