Cheatsheet: Linux Crontab
- PDF Link: cheatsheet-cron-A4.pdf, Category: linux
- Blog URL: https://cheatsheet.dennyzhang.com/cheatsheet-cron-A4
- Related posts: CheatSheet: shell, #denny-cheatsheets
1.1 Cron job – create
| Name | Comment |
|---|---|
| Create cron job runs every 5 mins | */5 * * * * /root/mycommand.sh |
| Runs every Friday at 9:10 AM | 10 9 * * 5 /root/mycommand.sh |
| Runs every midnight | 0 0 * * * /root/mycommand.sh |
| Redirect output to log file | 0 0 * * * /root/mycommand.sh >>/var/log/mycron.log 2>&1 |
| Install crontab by script | Put file to /etc/cron.d. Remember to set env |
1.2 Cron job – common
| Name | Comment |
|---|---|
| Find crontab daemon process | pgrep crond |
| List cron jobs created by automation | ls -lth /etc/cron* |
| List cron jobs created by me | crontab -l |
| Changing default crontab editor | export EDITOR=vim, export VISUAL=”nano” |
1.3 At
| Name | Comment |
|---|---|
| List all currently-queued at jobs | atq |
| Remove a job | atrm $jobid |
1.4 Shutdown
| Name | Comment |
|---|---|
| Shutdown system now | shutdown -r now |
| Shutdown system in 5 mins | shutdown -r +5 |
