List running services

To list all services and it's status you can use:

service --status-all

this command runs all init scripts, in alphabetical order, with the status command. This option only calls status for sysvinit jobs, upstart jobs can be queried in a similar manner with:

initctl list

In Redhat you can use:

chkconfig --list

You can also install chkconfig on ubuntu with:

sudo apt-get install chkconfig

The command:

sudo netstat -tulpn

might also be useful, it lists open Internet or UNIX domain sockets.