$ systemctl list-units -t service
UNIT LOAD ACTIVE SUB DESCRIPTION
auditd.service loaded active running Security Auditing Service
avahi-daemon.service loaded active running Avahi mDNS/DNS-SD Stack
chronyd.service loaded active running NTP client/server
crond.service loaded active running Command Scheduler
dbus.service loaded active running D-Bus System Message Bus
firewalld.service loaded active running firewalld - dynamic firewall daemon
getty@tty1.service loaded active running Getty on tty1
httpd.service loaded active running The Apache HTTP Server
iprdump.service loaded active running IBM Power Raid dump daemon
iprinit.service loaded active running IBM Power Raid init daemon
iprupdate.service loaded active running IBM Power Raid update daemon
kmod-static-nodes.service loaded active exited Create list of required static device nodes for
lvm2-lvmetad.service loaded active running LVM2 metadata daemon
lvm2-monitor.service loaded active exited Monitoring of LVM2 mirrors, snapshots etc. usin
lvm2-pvscan@252:2.service loaded active exited LVM2 PV scan on device 252:2
mariadb.service loaded active running MariaDB database server
network.service loaded active exited LSB: Bring up/down networking
NetworkManager.service loaded active running Network Manager
polkit.service loaded active running Authorization Manager
postfix.service loaded active running Postfix Mail Transport Agent
rhel-dmesg.service loaded active exited Dump dmesg to /var/log/dmesg
rhel-import-state.service loaded active exited Import network configuration from initramfs
rhel-readonly.service loaded active exited Configure read-only root support
rsyslog.service loaded active running System Logging Service
serial-getty@ttyS0.service loaded active running Serial Getty on ttyS0
sshd-keygen.service loaded active exited OpenSSH Server Key Generation
sshd.service loaded active running OpenSSH server daemon
systemd-fsck-root.service loaded active exited File System Check on Root Device
systemd-fsck@dev-disk-by\x2duuid-e4452af0\x2d005d\x2d4ca8\x2d9803\x2dbd47d46e10cd.service loaded active exited File
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-random-seed.service loaded active exited Load/Save Random Seed
systemd-remount-fs.service loaded active exited Remount Root and Kernel File Systems
systemd-sysctl.service loaded active exited Apply Kernel Variables
systemd-tmpfiles-setup-dev.service loaded active exited Create Static Device Nodes in /dev
systemd-tmpfiles-setup.service loaded active exited Create Volatile Files and Directories
systemd-udev-trigger.service loaded active exited udev Coldplug all Devices
systemd-udevd.service loaded active running udev Kernel Device Manager
systemd-update-utmp.service loaded active exited Update UTMP about System Boot/Shutdown
systemd-user-sessions.service loaded active exited Permit User Sessions
systemd-vconsole-setup.service loaded active exited Setup Virtual Console
tuned.service loaded active running Dynamic System Tuning Daemon
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
42 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.