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.

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.

UpGuard checks and validates configurations for every major OS, network device, and cloud provider.

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



alias to show my own configured ip

Terminal - alias to show my own configured ip
alias showip="ifconfig eth0 | grep 'inet addr:' | sed 's/.*addr\:\(.*\) Bcast\:.*/\1/'"
2009-03-25 07:50:12
User: dizzgo
Functions: alias
alias to show my own configured ip

parses the output of ifconfig to show only the configured ip address (in this case from interface eth0).

the regexp is quick'n'dirty im sure it can be done in a better way.

--> this alias does not show your "internet ip" when you're in a nat-environment


There are 16 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

ifconfig eth0 | grep inet | awk '{print $2}' | cut -d ':' -f2

Comment by P17 446 weeks and 6 days ago

and if we have two (or more) active network interfaces?

Comment by mpb 446 weeks and 6 days ago
ifconfig $if | egrep -o "inet addr:[^ ]*"
Comment by bandie91 446 weeks and 6 days ago

Assuming that the default route is via the network interface of interest:

/sbin/ifconfig $(netstat -rn | grep "^" | awk '{print $8}') | awk -F: '/inet addr/ {printf("%s\n",substr($2,1,index($2," "))) }'

Comment by mpb 446 weeks and 6 days ago

there must be a simpler way to do this...

Comment by elzapp 446 weeks and 6 days ago
ifconfig $(route|grep default|awk '{ print $8 }')|grep 'inet addr:' | sed 's/.*addr\:\(.*\) Bcast\:.*/\1/'

to show ip of default route

Comment by professoralex 440 weeks and 1 day ago

route -n | egrep "^0." | awk '{print "Gateway to the Word: "$2", via "$NF""}'

Comment by bandie91 437 weeks and 4 days ago

Your point of view

You must be signed in to comment.