service --status-all
service --status-all | more
service --status-all | grep ntpd
service --status-all | less
$ systemctl list-units --type=service
sudo service --status-all
#parameters --status-all, it lists the state of services controlled by System V
sudo service --status-all
#parameters --status-all, it lists the state of services controlled by System V
sudo service --status-all
#parameters --status-all, it lists the state of services controlled by System V
$ pstree | head -n 5