$ find /usr/lib/systemd/system/ -type f -executable | sort
/usr/lib/systemd/system/argus.service
/usr/lib/systemd/system/inadyn.service
/usr/lib/systemd/system/ntop.service
/usr/lib/systemd/system/partimaged.service
/usr/lib/systemd/system/pppoe-server.service
/usr/lib/systemd/system/vnstat.service
/usr/lib/systemd/system/wpa_supplicant.service
poma