cron.md

title	Cron
category	CLI
layout	2017/sheet
updated	2018-05-03
weight	-3

Format

{: .-two-column}

Format

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

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

Examples

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 Sun on 2:10am
0 0 * * 0	every Sunday midnight
---	---
@reboot	every reboot

Crontab

# Adding tasks easily
echo "@reboot echo hi" | crontab

# Open in editor
crontab -e

# List tasks
crontab -l [-u user]