>systemctl --no-pager list-units
  UNIT                                                                                         LOAD   ACTIVE SUB       DESCRIPTION                                                                           
  proc-sys-fs-binfmt_misc.automount                       loaded active running   Arbitrary Executable File Formats File System Automount Point                         
  sys-devices-platform-soc-20201000.serial-tty-ttyAMA0-hci0.device loaded active plugged   /sys/devices/platform/soc/20201000.serial/tty/ttyAMA0/hci0                            
  sys-devices-platform-soc-20201000.serial-tty-ttyAMA0.device      loaded active plugged   /sys/devices/platform/soc/20201000.serial/tty/ttyAMA0                                 
    aaaa-block-mmcblk0-mmcblk0p1.device                   loaded active plugged   /sys/devices/platform/soc/20202000.mmc/mmc_host/mmc0/mmc0:aaaa/block/mmcblk0/mmcblk0p1
    aaaa-block-mmcblk0-mmcblk0p2.device                   loaded active plugged   /sys/devices/platform/soc/20202000.mmc/mmc_host/mmc0/mmc0:aaaa/block/mmcblk0/mmcblk0p2
    aaaa-block-mmcblk0.device                              loaded active plugged   /sys/devices/platform/soc/20202000.mmc/mmc_host/mmc0/mmc0:aaaa/block/mmcblk0          
    0001-mmc1:0001:1-net-wlan0.device                      loaded active plugged   /sys/devices/platform/soc/20300000.mmc/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/wlan0  
    audio-bcm2835_alsa-sound-card0.device                  loaded active plugged   /sys/devices/platform/soc/soc:audio/bcm2835_alsa/sound/card0                          
  sys-devices-virtual-block-ram0.device                    loaded active plugged   /sys/devices/virtual/block/ram0                                                       
  sys-devices-virtual-block-ram1.device                    loaded active plugged   /sys/devices/virtual/block/ram1                                                       
  sys-devices-virtual-block-ram10.device                   loaded active plugged   /sys/devices/virtual/block/ram10                                                      
  sys-devices-virtual-block-ram11.device                   loaded active plugged   /sys/devices/virtual/block/ram11                                                      
  sys-devices-virtual-block-ram12.device                   loaded active plugged   /sys/devices/virtual/block/ram12                                                      
  sys-devices-virtual-block-ram13.device                   loaded active plugged   /sys/devices/virtual/block/ram13                                                      
  sys-devices-virtual-block-ram14.device                   loaded active plugged   /sys/devices/virtual/block/ram14                                                      
  sys-devices-virtual-block-ram15.device                   loaded active plugged   /sys/devices/virtual/block/ram15                                                      
  sys-devices-virtual-block-ram2.device                    loaded active plugged   /sys/devices/virtual/block/ram2                                                       
  sys-devices-virtual-block-ram3.device                    loaded active plugged   /sys/devices/virtual/block/ram3                                                       
  sys-devices-virtual-block-ram4.device                    loaded active plugged   /sys/devices/virtual/block/ram4                                                       
  sys-devices-virtual-block-ram5.device                    loaded active plugged   /sys/devices/virtual/block/ram5                                                       
  sys-devices-virtual-block-ram6.device                    loaded active plugged   /sys/devices/virtual/block/ram6                                                       
  sys-devices-virtual-block-ram7.device                    loaded active plugged   /sys/devices/virtual/block/ram7                                                       
  sys-devices-virtual-block-ram8.device                    loaded active plugged   /sys/devices/virtual/block/ram8                                                       
  sys-devices-virtual-block-ram9.device                    loaded active plugged   /sys/devices/virtual/block/ram9                                                       
  sys-devices-virtual-misc-rfkill.device                   loaded active plugged   /sys/devices/virtual/misc/rfkill                                                      
  sys-devices-virtual-tty-ttyprintk.device                 loaded active plugged   /sys/devices/virtual/tty/ttyprintk                                                    
  sys-module-configfs.device                               loaded active plugged   /sys/module/configfs                                                                  
  sys-subsystem-bluetooth-devices-hci0.device              loaded active plugged   /sys/subsystem/bluetooth/devices/hci0                                                 
  sys-subsystem-net-devices-wlan0.device                   loaded active plugged   /sys/subsystem/net/devices/wlan0                                                      
  -.mount                                                  loaded active mounted   Root Mount                                                                            
  boot.mount                                               loaded active mounted   /boot                                                                                 
  dev-mqueue.mount                                         loaded active mounted   POSIX Message Queue File System                                                       
  proc-sys-fs-binfmt_misc.mount                            loaded active mounted   Arbitrary Executable File Formats File System                                         
  run-rpc_pipefs.mount                                     loaded active mounted   RPC Pipe File System                                                                  
  run-user-501.mount                                       loaded active mounted   /run/user/501                                                                         
  sys-kernel-config.mount                                  loaded active mounted   Configuration File System                                                             
  sys-kernel-debug-tracing.mount                           loaded active mounted   /sys/kernel/debug/tracing                                                             
  sys-kernel-debug.mount                                   loaded active mounted   Debug File System                                                                     
  systemd-ask-password-plymouth.path                       loaded active waiting   Forward Password Requests to Plymouth Directory Watch                                 
  systemd-ask-password-wall.path                           loaded active waiting   Forward Password Requests to Wall Directory Watch                                     
  init.scope                                               loaded active running   System and Service Manager                                                            
  session-c50.scope                                        loaded active running   Session c50 of user dgerman                                                           
  session-c51.scope                                        loaded active running   Session c51 of user dgerman                                                           
  session-c52.scope                                        loaded active running   Session c52 of user dgerman                                                           
  alsa-restore.service                                     loaded active exited    Save/Restore Sound Card State                                                         
  avahi-daemon.service                                     loaded active running   Avahi mDNS/DNS-SD Stack                                                               
  binfmt-support.service                                   loaded active exited    Enable support for additional executable binary formats                               
  bluemon.service                                          loaded active exited    LSB: Bluetooth monitoring daemon                                                      
  bluetooth.service                                        loaded active running   Bluetooth service                                                                     
  console-setup.service                                    loaded active exited    Set console font and keymap                                                           
  cron.service                                             loaded active running   Regular background program processing daemon                                          
  dbus.service                                             loaded active running   D-Bus System Message Bus                                                              
  dhcpcd.service                                           loaded active running   dhcpcd on all interfaces                                                              
  dphys-swapfile.service                                   loaded active exited    LSB: Autogenerate and use a swap file                                                 
  fake-hwclock.service                                     loaded active exited    Restore / save the current clock                                                      
  getty@tty1.service                                       loaded active running   Getty on tty1                                                                         
  gldriver-test.service                                    loaded active exited    Check for v3d driver                                                                  
* grafana.service                                          loaded failed failed    Starts and stops a single grafana instance on this system                             
  hciuart.service                                          loaded active running   Configure Bluetooth Modems connected by UART                                          
  influxdb.service                                         loaded active running   InfluxDB is an open-source, distributed, time series database                         
  keyboard-setup.service                                   loaded active exited    Set the console keyboard layout                                                       
  kmod-static-nodes.service                                loaded active exited    Create list of required static device nodes for the current kernel                    
  networking.service                                       loaded active exited    Raise network interfaces                                                              
  packagekit.service                                       loaded active running   PackageKit Daemon                                                                     
  polkit.service                                           loaded active running   Authorization Manager                                                                 
  raspi-config.service                                     loaded active exited    LSB: Switch to ondemand cpu governor (unless shift key is pressed)                    
  rc-local.service                                         loaded active exited    /etc/rc.local Compatibility                                                           
* resize2fs_once.service                                   loaded failed failed    LSB: Resize the root filesystem                                                       
  rsyslog.service                                          loaded active running   System Logging Service                                                                
  ruuvicollector.service                                   loaded active running   My service                                                                            
  ssh.service                                              loaded active running   OpenBSD Secure Shell server                                                           
  systemd-fsck-root.service                                loaded active exited    File System Check on Root Device                                                      
        \x2dpartuuid-c5b4c492\x2d01.service                loaded active exited    File System Check on /dev/disk/by-partuuid/c5b4c492-01                                
  systemd-journal-flush.service                            loaded active exited    Flush Journal to Persistent Storage                                                   
  systemd-journald.service                                 loaded active running   Journal Service                                                                       
  systemd-logind.service                                   loaded active running   Login Service                                                                         
  systemd-modules-load.service                             loaded active exited    Load Kernel Modules                                                                   
  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-timesyncd.service                                loaded active running   Network Time Synchronization                                                          
  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                                                                  
  triggerhappy.service                                     loaded active running   triggerhappy global hotkey daemon                                                     
  user@501.service                                         loaded active running   User Manager for UID 501                                                              
  -.slice                                                  loaded active active    Root Slice                                                                            
  system-getty.slice                                       loaded active active    system-getty.slice                                                                    
  system-systemd\x2dfsck.slice                             loaded active active    system-systemd\x2dfsck.slice                                                          
  system.slice                                             loaded active active    System Slice                                                                          
  user-501.slice                                           loaded active active    User Slice of dgerman                                                                 
  user.slice                                               loaded active active    User and Session Slice                                                                
  avahi-daemon.socket                                      loaded active running   Avahi mDNS/DNS-SD Stack Activation Socket                                             
  dbus.socket                                              loaded active running   D-Bus System Message Bus Socket                                                       
  syslog.socket                                            loaded active running   Syslog Socket                                                                         
  systemd-fsckd.socket                                     loaded active listening fsck to fsckd communication Socket                                                    
  systemd-initctl.socket                                   loaded active listening /dev/initctl Compatibility Named Pipe                                                 
  systemd-journald-dev-log.socket                          loaded active running   Journal Socket (/dev/log)                                                             
  systemd-journald.socket                                  loaded active running   Journal Socket                                                                        
  systemd-rfkill.socket                                    loaded active listening Load/Save RF Kill Switch Status /dev/rfkill Watch                                     
  systemd-udevd-control.socket                             loaded active running   udev Control Socket                                                                   
  systemd-udevd-kernel.socket                              loaded active running   udev Kernel Socket                                                                    
  triggerhappy.socket                                      loaded active running   triggerhappy.socket                                                                   
  var-swap.swap                                            loaded active active    /var/swap                                                                             
  basic.target                                             loaded active active    Basic System                                                                          
  bluetooth.target                                         loaded active active    Bluetooth                                                                             
  cryptsetup.target                                        loaded active active    Encrypted Volumes                                                                     
  getty.target                                             loaded active active    Login Prompts                                                                         
  local-fs-pre.target                                      loaded active active    Local File Systems (Pre)                                                              
  local-fs.target                                          loaded active active    Local File Systems                                                                    
  multi-user.target                                        loaded active active    Multi-User System                                                                     
  network-online.target                                    loaded active active    Network is Online                                                                     
  network.target                                           loaded active active    Network                                                                               
  nfs-client.target                                        loaded active active    NFS client services                                                                   
  paths.target                                             loaded active active    Paths                                                                                 
  remote-fs-pre.target                                     loaded active active    Remote File Systems (Pre)                                                             
  remote-fs.target                                         loaded active active    Remote File Systems                                                                   
  slices.target                                            loaded active active    Slices                                                                                
  sockets.target                                           loaded active active    Sockets                                                                               
  sound.target                                             loaded active active    Sound Card                                                                            
  swap.target                                              loaded active active    Swap                                                                                  
  sysinit.target                                           loaded active active    System Initialization                                                                 
  time-sync.target                                         loaded active active    System Time Synchronized                                                              
  timers.target                                            loaded active active    Timers                                                                                
  anacron.timer                                            loaded active waiting   Trigger anacron every hour                                                            
  apt-daily-upgrade.timer                                  loaded active waiting   Daily apt upgrade and clean activities                                                
  apt-daily.timer                                          loaded active waiting   Daily apt download activities                                                         
  systemd-tmpfiles-clean.timer                             loaded active waiting   Daily Cleanup of Temporary Directories                                                

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.

131 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.