Am I running systemd or good old init?
To determine whether or not you're using old school, System V init or systemd (or a mix!), do the following:
$ cat /proc/1/comm systemd $ ls -l /sbin/init lrwxrwxrwx 1 root root 20 May 26 08:07 /sbin/init -> /lib/systemd/systemd
Here, the system is using systemd.
If System V was in use, "init" would be printed in the first command and
the latter command would show no symlink to