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List Services
All possible services are in:
ls /etc/sv
The computer only uses those in /var/service, so symbolic links are made to start and stop services.
ls /var/service
Start Services
Enable the sshd service, so that ssh will work every time you boot up:
sudo ln -s /etc/sv/sshd /var/service
Then start the service:
sudo sv start sshd
Stop Services
Stop mpd with:
sudo sv stop mpd
And stop it starting at startup with:
sudo rm /var/service/mpd
You can also just make a file called 'down':
sudo touch /var/service/mpd/down
This means you can start and stop the service without making symbolic links, but mpd will be 'down' when the computer starts.
Making a Service
Look in the /etc/sv directory, then in the existing services' 'run' files.
You'll find a simple dash script (therefore Posix compliant).
You can write your own, just stick in the shebang #!/bin/sh.
If unsure, use #!/bin/bash as the first line. When Void Linux says sh, it means dash shell, not bash.
Confirm the shell you'll use:
ls -l $(which sh)