Where to place a shell script?

Hello fellow computer people :)

I have a shell script that I will use as a watchdog timer. It checks to see if my other 'main' program is running. If it is not, it restarts it.

The question is: How do I get this installed on a Mac? Is there a folder/plist file scenario somewhere where the OS will automatically and periodically call the script, ensuring that my program never goes that long without running? I would ideally like to test every minute, but every hour or even a couple of times a day would be satisfactory.

Tha开发者_开发百科nk you!

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The way to do this on Mac OS X is using Launch Services. It replaces the older system services such as init and crontab and provides a single, unified framework for managing system services.

In your case, you probably don't need a separate script - keeping an instance of your app running should be handled by the system. First you need to create .plist file that describes your daemon/script/application. You place it in one of the following locations, depending on the type of service:

• ~/Library/LaunchAgents: Per-user agents provided by the user.
• /Library/LaunchAgents: Per-user agents provided by the administrator.
• /Library/LaunchDaemons: System wide daemons provided by the administrator.
• /System/Library/LaunchAgents: Mac OS X Per-user agents.
• /System/Library/LaunchDaemons: Mac OS X System wide daemons.

Once you have defined the service, you can use the launchctl command to control launchd. For example, you can list running services, start/stop services, and so on.

The full documentation is here:

• Creating launchd Daemons and Agents
• Daemons vs Agents

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I'm not a Mac user but there should be cron daemon. http://hints.macworld.com/article.php?story=2001020700163714

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Crontab should do you nicely. Set your script to run every X minutes and cron will do the rest. If you prefer a GUI interface to your programs, try cronnix.