125 lines
2.6 KiB
Markdown
125 lines
2.6 KiB
Markdown
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.
|
||
|
||
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/).
|
||
|
||
The official source is found [here](https://launchd.info/).
|
||
|
||
Here are some helpful tips;
|
||
|
||
View Services
|
||
```
|
||
sudo launchctl list
|
||
```
|
||
|
||
|
||
without Sudo
|
||
```
|
||
$ sudo launchctl list | grep ssh
|
||
- 0 com.openssh.sshd
|
||
|
||
$ launchctl list | grep ssh
|
||
3521 0 com.openssh.ssh-agent
|
||
```
|
||
|
||
Particular Service details
|
||
|
||
```
|
||
$ sudo launchctl list com.openssh.sshd
|
||
{
|
||
"Wait" = false;
|
||
"Sockets" = {
|
||
"Listeners" = (
|
||
file-descriptor-object;
|
||
file-descriptor-object;
|
||
);
|
||
};
|
||
"LimitLoadToSessionType" = "System";
|
||
"StandardErrorPath" = "/dev/null";
|
||
"Label" = "com.openssh.sshd";
|
||
"inetdCompatibility" = true;
|
||
"OnDemand" = true;
|
||
"LastExitStatus" = 0;
|
||
"Program" = "/usr/libexec/sshd-keygen-wrapper";
|
||
"ProgramArguments" = (
|
||
"/usr/sbin/sshd";
|
||
"-i";
|
||
);
|
||
};
|
||
```
|
||
|
||
|
||
Stop and start service:
|
||
```
|
||
sudo launchctl stop com.openssh.sshd
|
||
|
||
sudo launchctl start com.openssh.sshd
|
||
```
|
||
|
||
|
||
Service definition via print:
|
||
```
|
||
sudo launchctl print system/com.openssh.sshd
|
||
```
|
||
|
||
|
||
Loading Services
|
||
|
||
```
|
||
# load
|
||
sudo launchctl load /System/Library/LaunchDaemons/ssh.plist
|
||
|
||
# enable
|
||
sudo launchctl enable system/com.openssh.sshd
|
||
|
||
# disable
|
||
sudo launchctl disable system/com.openssh.sshd
|
||
|
||
# unload
|
||
sudo launchctl unload /System/Library/LaunchDaemons/ssh.plist
|
||
```
|
||
|
||
via [Rakesh](https://rakhesh.com/mac/macos-launchctl-commands/)
|
||
|
||
---
|
||
### More things to test with Launchd
|
||
|
||
- Check that the script is an executable
|
||
```
|
||
```bash
|
||
chmod +x /Library/Scripts/com.apple.restart.sh
|
||
```
|
||
|
||
- enable the full path to the script
|
||
```
|
||
```bash
|
||
#!/bin/bash
|
||
/sbin/shutdown -r now
|
||
```
|
||
|
||
Found by
|
||
```
|
||
which shutdown
|
||
|
||
output:
|
||
|
||
/sbin/shutdown
|
||
```
|
||
|
||
Ensure that the output is ACII file and not RTF or Pages or MS-Word
|
||
```
|
||
file /Library/Scripts/com.apple.restart.sh
|
||
|
||
output:
|
||
/Library/Scripts/com.apple.restart.sh: Bourne-Again shell script text executable, ASCII text
|
||
|
||
```
|
||
|
||
Create a redirect for outputs:
|
||
```
|
||
<key>StandardOutPath</key>
|
||
<string>/tmp/com.apple.restart.stdout</string>
|
||
<key>StandardErrorPath</key>
|
||
<string>/tmp/com.apple.restart.stderr</string>
|
||
```
|
||
|
||
A great launchd blog [post on here too. ](https://ellismin.com/2020/03/launchd-1/) |