this post was submitted on 04 Oct 2023
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Enable and disable just create symlinks of the "just changing files" files in your example. It tells you this every time you install something that enables a service.
Want to do it manually? ln -s (or rm the link to "disable" it).
Want it to happen later in the init sequence? Put the link in a different .target directory.
All "systemctl enable" does is put the symlink in the target directory that's specified in the Install section of the unit file.
As for "specifying a service"... Everything is a unit file (yes, file), journalctl -u just means "only show me logs for this unit".
There's no flag for "specifying a service", you just type in the service name. If there's any ambiguity (eg. unit.service and unit.socket), you type the service name followed by .service
A flag you might find useful is -g, which means "grep for this string". You can combine this with -u to narrow it down.