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



Perl One Liner to Generate a Random IP Address

Terminal - Perl One Liner to Generate a Random IP Address
perl -e 'printf join ".", map int rand 256, 1 .. 4;'
2011-01-16 02:15:29
User: gml
Functions: join perl
Perl One Liner to Generate a Random IP Address


There is 1 alternative - vote for the best!

Terminal - Alternatives
echo $((RANDOM%256)).$((RANDOM%256)).$((RANDOM%256)).$((RANDOM%256))
perl -le '$,=".";print map int rand 256,1..4'
perl -e 'printf "00:16:3E:%02X:%02X:%02X\n", rand 0xFF, rand 0xFF, rand 0xFF'
perl -le '$,=".";print map int rand 256,1..4'
perl -e 'printf "%vd\n",pack "N",rand 256**4'

Know a better way?

If you can do better, submit your command here.

What others think

perl -e 'printf join(".", ("%d")x4 ), map {rand 256} 1..4;'
Comment by stanishjohnd 379 weeks and 2 days ago

yes for some reason commandlinefu is really screwing up the text entry on this one i'm not sure why i've tried twice to correct it but have had no luck.

Comment by gml 379 weeks and 2 days ago
perl -le 'print join ".", map int rand 256, 1..4'
Comment by seungwon 379 weeks ago

Your point of view

You must be signed in to comment.