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==Scheduling with "at"== This tip shows you how to schedule events in Linux with the at command. While cron is the more common scheduling utility in Linux, at is useful for scheduling one-time events, or simply setting a task to run at some date/time in the future. Code Listing 1: Getting at # emerge sys-apps/at or apt-get install at or ... Now that at is installed, the daemon must be started so that scheduled jobs can be run. Code Listing 2: Starting atd # /etc/init.d/atd start * Starting atd... [ ok ] Now you can start using at. Note: For security you may need to edit /etc/at/at.allow and /etc/at/at.deny. See the manpage for more information on securing at. Code Listing 3: Using // Set XMMS to play wakeup.ogg at 6am tomorrow morning % at 6am tomorrow at> xmms ~/music/wakeup.ogg at>
job 6 at 2003-10-31 06:00 // At 11:30 pm today, start an install of mozilla % at 11:30 pm today at> emerge update mozilla at>
job 7 at 2003-10-30 23:30 Now there are two jobs scheduled which will be run 'at' the specified times. To view a list of jobs you've scheduled, use atq. If you decide you don't want a job to run, you can can use the atrm command. Code Listing 4: Removing a previously scheduled job // Remove the 'emerge' job we scheduled for 11:30pm % atq 6 2003-10-31 06:00 a david 7 2003-10-30 23:30 a david % atrm 7 % atq 6 2003-10-31 06:00 a david For more information use man 1 at. From http://www.gentoo.org/news/en/gwn/20031103-newsletter.xml
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