Ubuntu - manage system services

make system service script

[root@y500-fedora ~]# cat /etc/systemd/system/foo.service 
[Unit]
Description=foo

[Service]
ExecStart=/bin/bash -c "while true; do /bin/inotifywait -qq --event close_write /sys/class/backlight/acpi_video0/brightness; su myusername -c '/bin/xbacklight -display :0 -set $(cat /sys/class/backlight/acpi_video0/brightness)'; done"

[Install]
WantedBy=multi-user.target

list all services

systemctl list-unit-files | grep enabled # list enabled services

systemctl list-units --type=service
# OR list all services
systemctl --type=service

systemctl list-units --type=service --state=active
# OR
systemctl --type=service --state=active

systemctl list-units --type=service --state=running 
# OR
systemctl --type=service --state=running

make alias to list services

alias running_services='systemctl list-units  --type=service  --state=running'

disable, remove services

systemctl stop [servicename]
systemctl disable [servicename]
rm /etc/systemd/system/[servicename]
rm /etc/systemd/system/[servicename] # and symlinks that might be related
rm /usr/lib/systemd/system/[servicename] 
rm /usr/lib/systemd/system/[servicename] # and symlinks that might be related
systemctl daemon-reload
systemctl reset-failed

install service

# copy to systemd folder
mv new_service /etc/systemd/system
# Reload systemd:
systemctl daemon-reload
# Enable the new service:
systemctl enable foo