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Unformatted text preview: At and Batch While cron is used to schedule recurring tasks, the at command is used to schedule a one-time task at a specific time and the batch command is used to schedule a one-time task to be executed when the systems load average drops below 0.8. To use at or batch , the at RPM package must be installed, and the atd service must be running. To determine if the package is installed, use the rpm -q at command. To determine if the service is running, use the command /sbin/service atd status . Configuring At Jobs To schedule a one-time job at a specific time, type the command at time , where time is the time to execute the command. The argument time can be one of the following: HH:MM format For example, 04:00 specifies 4:00 a.m. If the time is already past, it is executed at the specified time the next day. midnight Specifies 12:00 a.m. noon Specifies 12:00 p.m. teatime Specifies 4:00 p.m. month-name day year format For example, January 15 2002 specifies the 15th day of January in the year 2002. The year is optional. MMDDYY, MM/DD/YY, or MM.DD.YY formats For example, 011502 for the 15th day of January in the year 2002. now + time time is in minutes, hours, days, or weeks. For example, now + 5 days specifies that the command should be executed at the same time five days from now....
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- Fall '11