The launchd daemon was designed to remove the need for dependency ordering among daemons. In addition, launchd can start jobs at timed intervals.Īlthough launchd supports non-launch-on-demand daemons, this use is not recommended. The preferred method is on-demand launching, but launchd can launch daemons that run continuously, and can replace inetdfor launching inetd-style daemons. There are four ways to launch daemons using launchd. Thus, the term “daemon” is used generically in this section to encompass both system-level daemons and user agents except where otherwise noted. Unless otherwise noted, for the purposes of this chapter, the terms “daemon” and “agent” can be used interchangeably. A user agent is essentially identical to a daemon, but is specific to a given logged-in user and executes only while that user is logged in. These per-user processes are referred to as user agents. If you are running per-user background processes for OS X, launchd is also the preferred way to start these processes. It also improves the ability of administrators to manage the daemons running on a given system. Using launchd provides better performance and flexibility for daemons. If you are developing daemons to run on OS X, it is highly recommended that you design your daemons to be launchd compliant. There is also an example xml property lists file at the end of the manual page for Previous Creating Launch Daemons and Agents System/Library/LaunchDaemons System-wide daemons provided by OS X. System/Library/LaunchAgents Per-user agents provided by OS X. Library/LaunchDaemons System-wide daemons provided by the administrator. Library/LaunchAgents Per-user agents provided by the administrator. ~/Library/LaunchAgents Per-user agents provided by the user. Per the manual pages for launchctl and ist the PLIST files for Launch Agents and Launch Daemons belong in specific directories: FILES If you are going to use Launch Agents and Launch Daemons, I highly recommend you read the manual pages for launchctl, ist and launchd. man launchctl, or to more easily read the manual pages, just type the commands name and right-click on it selecting: Open man Page To review the manual pages, in Terminal, use man command where command is the commands name, e.g. Also note that when using the launchctl command for daemons, sudo may be required in some cases, however do not use sudo to load agents with launchctl, as it will load them as a daemon. Note: The use of sudo is required when dealing with agents and daemons that are in the designated locations other then ~/Library/LaunchAgents in order to create, modify, change permissions to make read-only, delete, etc. Or as an alternative, just use: CalculatorĪdditional testing was done with an application bundle ( myApp.app) created by me, saved in /Applications on macOS Catalina, and the following values worked for me: /Applications/myApp.app Use the following command before cd ~/Library/LaunchAgents: mkdir -p ~/Library/LaunchAgentsĭue to changes made by Apple in macOS Catalina the fully qualified pathname for the Calculator is: /System/Applications/Calculator.app In a clean install of macOS Catalina, ~/Library/LaunchAgents doesn't exist by default. Now Calculator will open at the set time, which is set using 24 Hour time, e.g 0 through 23 for the Hour key. īack in Terminal, execute: launchctl load Note: This was done under macOS High Sierra and if using macOS Catalina there are some changes to the example, which are detailed is a note further below.Īs a test, in Terminal, I executed the following commands: cd ~/Library/LaunchAgentsĬopy and paste the following example PLIST XML code into the opened file, setting the StartCalendarInterval for a few minutes from now, and then save and close it.In addition to the comments I've made to your OP, use this example to fix the issues you are having.
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