Use crontab in Linux to create scheduled tasks

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 </etc/motd *************** explanation: information in the/etc/motd broadcast on Tuesday and Friday is **************************** * ******************/2 12-14*3-6, 9-12 1-5 bash_scripts **** * ************** explanation: run the *** crontab configuration file every two minutes from Monday to Friday in the 3-6 months of each year, and from Monday to Friday in the 9-12 months in the/etc/crontab.