Use crontab in Linux to create scheduled tasks

In Linux, use crontab to create scheduled tasks. in linux, start the crontab service:/etc/init. d/crondstartcrontab command format crontab-l displays the current crontab file (the crontab file compiled by default will be saved in (/var/spool/cron/username example... in Linux, use crontab to create scheduled tasks. in linux, start the crontab service:/etc/init. the command format of d/crond startcrontab: crontab-l displays the current crontab file (the crontab file written by default is saved in (/var/spool/cron/user name for example: /var/spool/cron/roger) crontab-r deletes the current crontab (use this method with caution because all scheduled tasks will be deleted) crontab-e use the editor to edit the file format of the current crontab file crontab: minutes hour day-of-month-of-year day-of-week commands for example: 0 4 ** 2, 5/usr/bin/wall