I want a script (bash/zsh/ruby/...) to run at boot time in OS X. What's the most simple way to do this, without messing with xml/plist files, and preferably not needing to make a meta AppleScript.
3 Answers
MacOS X uses Vixie cron, which has special meta tags for launching at reboot time. See the man page for the file format.
something like:
@reboot /path/to/script.sh
in your crontab would work. I'm not sure that this a better solution than launchd, you probably have more meta tools that look at launchd than cron.
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Love it, you proved me wrong :-) Although
cron
on OS X is not that great with logging by default (there was a topic on that just a few days ago).– Daniel Beck ♦Feb 14, 2011 at 16:16 -
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1Note that cron, at, and so on are to some extent deprecated in OS X. I can't find an explicit statement of that in the various docs, nor do I know how aggressively deprecated they are, but launchd does seem generally preferred. See the launchd documentation for an introduction. Feb 15, 2011 at 18:55
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In case you change your opinion:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.superuser.245713</string>
<key>ProgramArguments</key>
<array>
<string>/path/to/script.sh</string>
</array>
<key>UserName</key>
<string>someuser</string>
</dict>
</plist>
Store as com.superuser.245713.plist
in /Library/LaunchAgents/
and make root:wheel
the owner/group.
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1It's arguably better to put it into
/Library/LaunchAgents
rather than/System/Library/LaunchDaemons
since/System
is OS-specific stuff and the one under/Library
is used more for third party stuff. Also,LaunchDaemons
"should contain items that will run as root, generally background processes" where asLaunchAgents
"run as a user or in the context of userland". The source for those quotes is a great article on launchd that I consult for launchd questions. Feb 14, 2011 at 16:19 -
@DougHarris Thanks for the suggestions! I have to admit I was just typing this ad-hoc -- while I usually test my solutions, I wasn't willing to restart my machine for this.– Daniel Beck ♦Feb 14, 2011 at 16:22
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This is very nice, although I like the Vixie cron solution better :) Feb 14, 2011 at 18:59
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Actually, it should be put in /Library/LaunchDaemons. Agents only run inside a user session, i.e. they won't run (or more precisely, become eligible to run) until someone logs in, will run again every time someone logs in, and always run as the currently logged in user. Daemons run (/become eligible to run) at boot, and while they normally run as root, can be run as some other user with the UserName key. Apr 25, 2012 at 4:56
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2
There are also Login Hooks if you would prefer the script to run (as root) when a user logs in rather than when the machine is booted.
Here is an example which provides a briefer explanation about them: How to run a script at login/logout in OS X?