What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. 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.

If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.

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.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

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:



May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Top Tags



Watch Network Service Activity in Real-time

Terminal - Watch Network Service Activity in Real-time
lsof -i
2009-04-25 14:24:04
User: hank
Watch Network Service Activity in Real-time


There are 2 alternatives - vote for the best!

Terminal - Alternatives
lsof -i
2009-06-30 22:36:00

I prefer to use this and not the -n variety, so I get DNS-resolved hostnames. Nice when I'm trying to figure out who's got that port open.

netstat -ntauple

Know a better way?

If you can do better, submit your command here.

What others think

try iptraf. lsof -i is a one time deal. real-time would imply that you could see network activity as it happens in a continuous manner. iptraf is a basic utility that lets you do just that.

Comment by linuxrawkstar 378 weeks and 4 days ago

Thanks - iptraf is pretty effin cool!

Comment by hank 378 weeks and 4 days ago

To make it keep running until you hit ctrl-c:

lsof -i -r
Comment by unixmonkey3441 378 weeks and 4 days ago

awesome! I also like the output of the slightly longer:

watch "lsof -i"

Comment by icetek 378 weeks and 1 day ago

ugh.. noob alert, it should be:

watch "lsof -i"
Comment by icetek 378 weeks and 1 day ago

Same thing using ip address instead of dns hostname

lsof -Pan -i tcp -i udp

Comment by solarislackware 347 weeks and 1 day ago

lsof -Pni4

works for me

Comment by al3x 160 weeks and 6 days ago

Your point of view

You must be signed in to comment.