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Operating Systems OS X (Apple) How to execute a command when system boots? Post 302512376 by tlarkin on Saturday 9th of April 2011 07:53:59 PM
Old 04-09-2011
Quote:
Originally Posted by andrewust
I am the only user of this machine. So I guess I will choose (1).
Could you give me an example? I would like to create a ram disk when system starts up, so that I can use it as a temp folder. The command is:
diskutil erasevolume HFS+ 'ramdisk' `hdiutil attach -nomount ram://262144`

Thanks!
Launchd is a lot like cron, but more. You can Google for an app called Lingon, which will help you generate launchd items. You would just need to make a system deamon that runs your command and toss your plist file in /Library/LaunchdDaemons, then use launchctl to load it and you are set.

Here is an article explaining it

AFP548 - launchd in Depth
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SystemStarter(8)					    BSD System Manager's Manual 					  SystemStarter(8)

NAME
SystemStarter -- Start, stop, and restart system services SYNOPSIS
SystemStarter [-gvxdDqn] [action [service]] DESCRIPTION
The SystemStarter utility is deprecated. System services should instead be described by a launchd.plist(5). See launchd(8) for more details. The launchd utility is available on Mac OS X 10.4 and later. In earlier versions of Mac OS X, the SystemStarter utility is used to start, stop, and restart the system services which are described in the /Library/StartupItems/ and /System/Library/StartupItems/ paths. The optional action argument specifies which action SystemStarter performs on the startup items. The optional service argument specifies which startup items to perform the action on. If no service is specified, all startup items will be acted on; otherwise, only the item pro- viding the service, any items it requires, or any items that depend on it will be acted on. During boot SystemStarter is invoked by launchd(8) and is responsible for starting all startup items in an order that satisfies each item's requirements. ACTIONS
start start all items, or start the item that provides the specified service and all items providing services it requires. stop stop all items, or stop the item that provides the specified service and all items that depend on it. restart restart all items, or restart the item providing the specified service. OPTIONS
-g (ignored) -v verbose (text mode) startup -x (ignored) -r (ignored) -d print debugging output -D print debugging output and dependencies -q be quiet (disable debugging output) -n don't actually perform action on items (no-run mode) NOTES
Unless an explicit call to ConsoleMessage is made, SystemStarter examines the exit status of the startup item scripts to determine the suc- cess or failure of the services provided by that script. FILES
/Library/StartupItems/ User-installed startup items. /System/Library/StartupItems/ System-provided startup items. SEE ALSO
ConsoleMessage(8), launchd(8), launchd.plist(5), rc(8) HISTORY
The SystemStarter utility appeared in Darwin 1.0 and was extended in Darwin 6.0 to support partial startup and interprocess communication. SystemStarter was deprecated by launchd(8) in Darwin 8.0. Darwin April 12, 2002 Darwin
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