Working with "crontab" Scheduler
Cron is a handy little utility that helps the system administrator automate repetitive tasks. In Linux, tasks can be configured to run automatically within a given period of time and on given dates. Red Hat Linux comes preconfigured to run certain system tasks to keep your system updated. For example, the slocate database is updated daily. A system administrator can use automated tasks to perform periodic backups, monitor the system, run custom scripts etc. It uses "crond" deamon. The cron system uses the following files: /usr/sbin/crond - The cron service which runs continuously /etc/crontab - The system cron table, which specifies def jobs defined by RHEL /usr/bin/crontab - Users create and manage cron table entries /var/spool/cron/* - The directory that holds cron files created by users /etc/cron.d/* - The directory that holds cron files created by package installation scripts /etc/cron.allow - Access Allow File /etc/cron.deny - Access Deny File /etc/cron.h...