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This question already has an answer here:

Is there a way to determine which init system is being used in Linux? (such as sysvinit, upstart, systemd, etc.) I don't care if it can be programmatically determined, I just want to know how I can figure it out.

I'm aware of Bash- detect init system, but that is about detecting the init system from bash in order to write a cross-init-system daemon. The answers from it do not provide a clear way to determine this because they are targeting specifically a programmatic solution which I am not interested in.

merged by Michael Mrozek Mar 27 '14 at 0:31

This question was merged with Detect init system using the shell because it is an exact duplicate of that question.