lsof to view running services and ports

[alok]

Now you want to know what services are running on the Linux server and on which ports. You have netstat coming as the first choice of command for this job. Good !!

But you can also use "lsof" command for the purpose.

Code: Select all

lsof -Pnl +M -i4

for checking IPv4 ports, and

Code: Select all

lsof -Pnl +M -i6

for checking IPv6 ports

Here:
-P - will stop the conversion of port numbers to port names for network files. This will make lsof run a little faster.

-n - will stop conversion of network numbers to host names for network files. Useful where host name lookup is not working properly.

-l - will stop conversion of user ID numbers to login names.

+M - reports portmapper registrations for local TCP and UDP ports.

-i4 - IPv4 listing only
-i6 - IPv6 listing only

You can use the lsof command without -Pnl and +M option to see the difference in the output.

Here is a sample output from my system. You can also view this post on Network NUTS Facebook Page at http://www.facebook.com/networknuts

lsof showing running services and ports