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:



2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.

Top Tags



All IP connected to my host

Terminal - All IP connected to my host
netstat -lantp | grep ESTABLISHED |awk '{print $5}' | awk -F: '{print $1}' | sort -u
2011-07-21 21:23:10
User: bitbasher
Functions: awk grep netstat sort
All IP connected to my host

find all computer connected to my host through TCP connection.


There are 2 alternatives - vote for the best!

Terminal - Alternatives
netstat -nut | sed '/ESTABLISHED/!d;s/.*[\t ]\+\(.*\):.*/\1/' | sort -u
netstat -nut | awk '$NF=="ESTABLISHED" {print $5}' | cut -d: -f1 | sort -u
2011-07-27 07:24:10
User: bitbasher
Functions: awk cut netstat sort

find all computer connected to my host through TCP connection

Know a better way?

If you can do better, submit your command here.

What others think

Does not support IPv6. Returns first segment of address only.

root@host:~# netstat -lantp | grep ESTABLISHED |awk '{print $5}' | awk -F: '{print $1}' | sort -u


Comment by unixmonkey23784 195 weeks and 2 days ago

unixmonkey23784 --> Is it ok now (Don't have ipv6)

# netstat -lantp | grep ESTABLISHED |awk '{print $5}' | awk '{print $1}' | sort -u

(with ipv4, also display port due to the lack of "-F :")

Hope it will be helpfull... First contribution ...

Comment by n3wborn 195 weeks and 2 days ago

Options -l, -p and -a are useless in this netstat call. This command also misses *all* udp connections.

Full list, sorted as in original post, would be given by: netstat -nut | awk '$NF=="ESTABLISHED" {print $5}' | cut -d: -f1 | sort -u

Comment by depesz 195 weeks and 2 days ago

it is inefficient to pipe awk to awk.

Comment by Mozai 195 weeks and 2 days ago

sudo netstat -nut | sed '/ESTABLISHED/!d;s/.*[\t ]\+\(.*\):.*/\1/'

Comment by plasticdoc 195 weeks ago

shorter (thanks to the help of e36freak on freenode for the + sign that I missed) :

netstat -nut | awk -F'[ :]+' '/SHED *$/{print $6}'
Comment by sputnick 193 weeks and 5 days ago

Your point of view

You must be signed in to comment.