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Linux Cron Cheat Sheet
Cron is a scheduling system for POSIX computers
Notation
- Minute Hour Date Month Weekday
Examples
10 * * * * At the 10th minute of every hour of every day
*/10 * * * * Every 10 minutes
10 14 * * * At 14:10
10 14 1 * * At 14:10 on the first day of the month
10 14 15 1 * At 14:10 on 15 January
0 2 15 10 * At 2 AM on 15 October
0 3 * 10 0 At 3 AM on all Sundays in October
0 3 * 10 1 At 3 AM on all Mondays in October
@yearly @annually Shorthand for once a year (1 January)
@monthly @weekly @daily Shorthand for once a month
@hourly Shorthand for on every hour
@reboot On reboot
Command
Cron configuration is stored in a file called a crontab, which is specific to each user.
crontab -e Edit your crontab file
crontab -l List all entries in your crontab
crontab -r -i Remove the default crontab, after asking for confirmation
crontab -u Specify a different user's crontab
Files
/etc/cron.d Location for system cron entries
/etc/crontab Legacy system crontab
/var/spool/cron Location for user crontabs
/lib/systemd/system/crontab.service systemd cron service (systemd scans traditional cron locations and executes cron jobs as expected)
Tags : Linux,
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