127 lines
2.7 KiB
Markdown
127 lines
2.7 KiB
Markdown
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A MacOS specific version of a [cron](obsidian://open?vault=enter&file=Coding%20Tips%20(Classical)%2FTerminal%20Tips%2FShells%2FComputers%20(operating%20system)%2FLinux%2FCrontab) that automates scripts and programs.
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In computing, **launchd**, a unified operating system service management framework, starts, stops and manages daemons, applications, processes, and scripts in macOS. It was introduced with Mac OS X Tiger and is licensed under the Apache License —Wikipedia. For more tips with launchd please head [here](https://www.maketecheasier.com/use-launchd-run-scripts-on-schedule-macos/).
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The official source is found [here](https://launchd.info/). My version of LaunchControl for GUI troubleshooting is found [here](https://soma-zone.com/download/).
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---
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Here are some helpful tips;
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View Services
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```
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sudo launchctl list
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```
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without Sudo
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```
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$ sudo launchctl list | grep ssh
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- 0 com.openssh.sshd
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$ launchctl list | grep ssh
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3521 0 com.openssh.ssh-agent
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```
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Particular Service details
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```
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$ sudo launchctl list com.openssh.sshd
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{
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"Wait" = false;
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"Sockets" = {
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"Listeners" = (
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file-descriptor-object;
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file-descriptor-object;
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);
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};
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"LimitLoadToSessionType" = "System";
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"StandardErrorPath" = "/dev/null";
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"Label" = "com.openssh.sshd";
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"inetdCompatibility" = true;
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"OnDemand" = true;
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"LastExitStatus" = 0;
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"Program" = "/usr/libexec/sshd-keygen-wrapper";
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"ProgramArguments" = (
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"/usr/sbin/sshd";
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"-i";
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);
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};
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```
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Stop and start service:
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```
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sudo launchctl stop com.openssh.sshd
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sudo launchctl start com.openssh.sshd
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```
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Service definition via print:
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```
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sudo launchctl print system/com.openssh.sshd
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```
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Loading Services
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```
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# load
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sudo launchctl load /System/Library/LaunchDaemons/ssh.plist
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# enable
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sudo launchctl enable system/com.openssh.sshd
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# disable
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sudo launchctl disable system/com.openssh.sshd
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# unload
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sudo launchctl unload /System/Library/LaunchDaemons/ssh.plist
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```
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via [Rakesh](https://rakhesh.com/mac/macos-launchctl-commands/)
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---
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### More things to test with Launchd
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- Check that the script is an executable
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```
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```bash
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chmod +x /Library/Scripts/com.apple.restart.sh
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```
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- enable the full path to the script
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```
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```bash
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#!/bin/bash
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/sbin/shutdown -r now
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```
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Found by
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```
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which shutdown
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output:
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/sbin/shutdown
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```
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Ensure that the output is ACII file and not RTF or Pages or MS-Word
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```
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file /Library/Scripts/com.apple.restart.sh
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output:
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/Library/Scripts/com.apple.restart.sh: Bourne-Again shell script text executable, ASCII text
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```
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Create a redirect for outputs:
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```
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<key>StandardOutPath</key>
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<string>/tmp/com.apple.restart.stdout</string>
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<key>StandardErrorPath</key>
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<string>/tmp/com.apple.restart.stderr</string>
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```
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A great launchd blog [post on here too. ](https://ellismin.com/2020/03/launchd-1/)
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