cron（cron）.docVIP

cron（cron） #cd /etc #vi test / / crond new task, a task for each row 01 * * * * root wall hello #crontab test / / test documents submitted to the crond daemon. Show the current task #crontab / / -l #service crond restart #chkconfig crond on Related knowledge points: ------------------------------------------------------------------------------------------------------------- 1.cron is a timed execution tool under Linux that can run jobs without human intervention. Because Cron is built Linux services, but it does not automatically, you can start, turn off the service with the following methods: /sbin/service crond start / / start service /sbin/service crond stop / / close service /sbin/service crond restart / / restart service /sbin/service crond reload / / reload configuration 2., you can also start this service automatically when the system is started: At the end of this script for /etc/rc.d/rc.local, add: /sbin/service crond start Now that the Cron service is already in progress, we can use this service, and the Cron service provides the following interfaces for you to use: 3. edit directly with the crontab command The cron service provides the crontab command to set up the cron service. Here are some of the parameters and instructions for this command: Crontab -u / / set a users cron service, root users need this parameter when executing this command. Details of crontab -l / a cron service user list Crontab -r / / delete a users cron service Crontab -e / / edit a users cron service For example, root looks at your own cron settings: crontab, -u, root, -l For example, root wants to delete the Fred settings for cron: crontab, -u, Fred, -r When editing the cron service, the edited content has some formatting and conventions. Enter: crontab, -u, root, -e In the VI edit mode, the content of the editor must conform to the following format: */1 * * * * ls /tmp/ls.txt A part of this format is the time setting, the back part is the command to execute the command to execute