Find the location of a systemd unit file service

Solution 1:

For units that are defined in actual, static files, this can be seen in systemctl status:

$ systemctl status halt-local.service
● halt-local.service - /usr/sbin/halt.local Compatibility
   Loaded: loaded (/lib/systemd/system/halt-local.service; static)
   Active: inactive (dead)

But there are units that are not defined by files, e.g. with systemd-cron installed. These have no useful location listed with status:

$ systemctl status cron-jojo-0.timer
● cron-jojo-0.timer - [Cron] "*/10 * * * * ..."
   Loaded: loaded (/var/spool/cron/crontabs/jojo)
   Active: active (waiting) since Mon 2015-05-18 14:53:01 UTC; 9min ago

In either case, though, the FragmentPath field is educating:

$ systemctl show -p FragmentPath cron-daily.service
FragmentPath=/lib/systemd/system/cron-daily.service
$ systemctl show -p FragmentPath cron-jojo-0.service
FragmentPath=/run/systemd/generator/cron-jojo-0.service
$ systemctl show -p FragmentPath halt-local.service
FragmentPath=/lib/systemd/system/halt-local.service