19. netstat

me@box:~$ netstat -anp | grep LISTEN | egrep -v '^unix'

tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 4328/sshd

tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 14730/cupsd

tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 4775/mysqld

tcp 0 0 127.0.0.1:5900 0.0.0.0:* LISTEN 7599/qemu-system-x8

tcp 0 0 127.0.0.1:5939 0.0.0.0:* LISTEN 4528/teamviewerd

tcp6 0 0 :::22 :::* LISTEN 4328/sshd

tcp6 0 0 ::1:631 :::* LISTEN 14730/cupsd

tcp6 0 0 :::80 :::* LISTEN 4594/apache2