In OS X, you can run a background job on a timed schedule in two ways:
launchd jobs and cron jobs. (Older approaches, such as at jobs and periodic jobs are deprecated and should not be used.) This section explains these methods briefly and provides links to manual pages that provide additional details.
Timed Jobs Using launchd
The use of cron on OS X is discouraged. Launchd is used instead. Try man launchctl to get started. You have to create special XML files that define your jobs and put them in a special place with certain permissions. You'll usually just need to figure out launchctl load. Need to quickly see a list of all cron jobs on a computer? You can easily see all scheduled cron jobs by using the crontab command, and seeing cron data works the same on Mac as well as Linux and most other unix environments too. Free mac mp3 download app. Perhaps you have a script or task running and you’re.
The preferred way to add a timed job is to use
launchd . Each launchd job is described by a separate file. This means that you can manage launchd timed jobs by simply adding or removing a file.
To create a
launchd timed job, you should create a configuration property list file similar to those described in Creating a launchd Property List File except that you specify a StartCalendarInterval key containing a dictionary of time values. Raleway font free download mac.
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For example, the following property list runs the program
happybirthday at midnight every time July 11 falls on a Sunday.
For more information on these values, see the manual page for
launchd.plist .
Timed Jobs Using cronMac Cron Job
Note: Although it is still supported,
cron is not a recommended solution. It has been deprecated in favor of launchd .
Systemwide
cron jobs can be installed by modifying /etc/crontab . Per-user cron jobs can be installed using the crontab tool. Rca rp5120-a software mac. The format of these crontab files is described in the man page for the crontab file format.
Because installing
cron jobs requires modifying a shared resource (the crontab file), you should not programmatically add a cron job.
Effects of Sleeping and Powering Off
If the system is turned off or asleep,
cron jobs do not execute; they will not run until the next designated time occurs.
If you schedule a
launchd job by setting the StartCalendarInterval App on mac to watch mpeg-4 videos download. key and the computer is asleep when the job should have run, your job will run when the computer wakes up. However, if the machine is off when the job should have run, the job does not execute until the next designated time occurs.
All other
launchd Baseball scorekeeping software for mac. Download chrome 34 for mac. jobs are skipped when the computer is turned off or asleep; they will not run until the next designated time occurs.
Parashar light software for mac. Consequently, if the computer is always off at the job’s scheduled time, both cron jobs and launchd jobs never run. For example, if you always turn your computer off at night, a job scheduled to run at 1 A.M. will never be run.
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