how to show list systemd ubuntu code example

Example 1: list all services using systemctl

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

## List running services
systemctl list-units  --type=service  --state=running

## List all svc in simplified way
service --status-all

Example 2: systemctl check availabe services

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