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A good starting point to get to know about Launch Daemon Process how to configure, troubleshoot and get some examples can be found here.

What is a Daemon A daemon is a program running in the background without requiring user input.

Task in Hand Create an shell script file to start mariadb (for simplicity of demo) Launch the shell script file as soon as the computer boots up (i.e.

This primarily checks if the mariadb service is enabled or not and then starts the service if it is stopped.

Job Description The behavior of a daemonagent is specified in a special XML file called a property list.

Depending on where it is stored it will be treated as a daemon or an agent.

Again, just to be clear between the difference between daemonagents: The main difference is that an agent is run on behalf of the logged in user while a daemon runs on behalf of the root user or any user you specify with the UserName key.

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In Mac OS X, the Launch Daemons are stored inside LibraryLaunchDaemons folder while the Launch Agents are inside LibraryLaunchAgents Now, lets create a property list file (.plist) here as root user.

Please note there are conventions in naming the plist file which is outside the scope of this article) sudo vim LibraryLaunchDaemonscom.startup.plist Configuration of the plist file will vary upon your use case.

The list of properties that can be configured is again nicely illustrated under the Configuration section on launchd.info For easier illustration, please check the following plit file and the inline commets: EnvironmentVariables PATH usrlocalbin:usrbin:bin:usrsbin:sbin: Label com.startup Program UsersadminScriptsstartupstartup.sh RunAtLoad KeepAlive LaunchOnlyOnce StandardOutPath tmpstartup.stdout StandardErrorPath tmpstartup.stderr UserName admin GroupName admin InitGroups Now that we have all the necessary files ready and in place, we need to add the property list file onto the launchctl as follows: -w flag permanently adds the plist to the Launch Daemon sudo launchctl load -w LibraryLaunchDaemonscom.startup.plist Other notes, To permanently remove the plist to the Launch Daemon -w flag permanently remove the plist to the Launch Daemon sudo launchctl unload -w LibraryLaunchDaemonscom.startup.plist Once a script is added onto the Launch Daemon it will auto-start even if the user runs the following command Will only temporarily stop.

It will again auto launch unless the service is explicitly stopped using launchctl unload command mariadb stop You can stop the launchctl process by sudo launchctl stop LibraryLaunchDaemonscom.startup.plist You can start the launchctl process by sudo launchctl start -w LibraryLaunchDaemonscom.startup.plist A Gist with the source files is provided here.

That is it Do let me know if this works for you Any suggestion for improvement will be most appreciated.

Sources: A Launchd Tutorial 429 11 Bash Mac Development Developer Tools Automation 429 claps 429 claps 11 response s Written by Fahim Hossain Follow Founder CEO at ARITS Limited.

More at Follow Written by Fahim Hossain Follow Founder CEO at ARITS Limited.

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