CRONTAB v19-02-11
Image source: Willi Glenz - Screenshot Crontab
$ ls /etc/cron*
# crontab -l
# crontab -e
> * * * * * echo "Test" >> /tmp/test.txt
> 0 9 * * * tar -zcf /var/backups/eclipse.tgz /home/userxyz/eclipse-workspace/
# service --status-all | less
# service cron status
/etc/cron.hourly
/etc/cron.daily
/etc/cron.weekly
/etc/cron.monthly
$ view /etc/cron.allow
$ view /etc/cron.deny
$ view /etc/crontab
$ man cron
$ man -a crontab
$ man 5 crontab