systemctl list-unit-files --state=enabled --no-pager|grep cups
cups.path                               enabled enabled
cups-browsed.service                    enabled enabled
cups.service                            enabled enabled
cups.socket                             enabled enabled
ron@ron-H81M-S2H:~$ cd /usr/lib/systemd/
ron@ron-H81M-S2H:/usr/lib/systemd$ ls
boot                            systemd-quotacheck
catalog                         systemd-random-seed
libsystemd-shared-246.so        systemd-remount-fs
logind.conf.d                   systemd-reply-password
network                         systemd-resolved
ntp-units.d                     systemd-rfkill
resolv.conf                     systemd-shutdown
system                          systemd-sleep
systemd                         systemd-socket-proxyd
systemd-ac-power                systemd-sulogin-shell
systemd-backlight               systemd-sysctl
systemd-binfmt                  systemd-sysv-install
systemd-bless-boot              systemd-timedated
systemd-boot-check-no-failures  systemd-timesyncd
systemd-cgroups-agent           systemd-time-wait-sync
systemd-cryptsetup              systemd-udevd
systemd-dissect                 systemd-update-utmp
systemd-fsck                    systemd-user-runtime-dir
systemd-fsckd                   systemd-user-sessions
systemd-growfs                  systemd-veritysetup
systemd-hibernate-resume        systemd-volatile-root
systemd-hostnamed               systemd-xdg-autostart-condition
systemd-initctl                 system-environment-generators
systemd-journald                system-generators
systemd-localed                 system-preset
systemd-logind                  system-shutdown
systemd-makefs                  system-sleep
systemd-modules-load            user
systemd-networkd                user-environment-generators
systemd-networkd-wait-online    user-generators
systemd-network-generator       user-preset
systemd-pstore