find process associated with a port

fuser [portnumber]/[proto]
e.g. fuser 25/tcp (see which pid is listening on smtp)

By: wwest4
2009-02-05 17:11:04

What Others Think

lsof -i tcp:25 gives a little more info; *both* fuser and lsof need root privileges to report processes other than the ones they run as, though (whereas netstat -ap will at least show you the port is open, though it won't find the pid without privileges...
eichin · 609 weeks and 6 days ago
For some reason fuser doesn't work sometimes, but lsof does. I will look into that later.
fsilveira · 609 weeks and 6 days ago
Great help! doula
aegyjingoo · 20 weeks and 1 day ago
awesome. learned alot. keep posting more welding companies in miami
looneyhans · 9 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: