Disabling services:

To disable a service and prevent it from starting at boot time, we can use the below command:


Masking a service:

When a service is masked, it can't be started at all.
We can mask a service manually by going to "/etc/systemd/system" and creating a symbolic link the "/dev/null" device for the service we want to disable as below:


Or we could simply do it using the below command:


Listing the services that run at a certain target (level):

We use the below command to see all the service that run in a certain level or target:



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