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



ramdomize echo 'hello world!'

Terminal - ramdomize echo 'hello world!'
(($RANDOM%6)) || echo 'hello world!'
2009-05-27 08:11:08
User: luishka
Functions: echo
ramdomize echo 'hello world!'

ramdomize the execution of the command echo 'hello world!'


There are 2 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

That command doesn't work. As currently displayed, it attempts to execute the result of the math (eg a number) or it runs the echo command. (This will lead to several '#: command not found.)

This would be a better command to do what you are attempting:

if [[ $(($RANDOM%6)) == 0 ]] then; echo 'hello, world!'; fi

Comment by unixmonkey3957 374 weeks ago

Oops, the ";" goes after the "]]". Eliminate ";" after "then".

Comment by unixmonkey3957 374 weeks ago

strange.. it works on my system :(

Comment by luishka 374 weeks ago

On zsh and bash 4.0 (2 sh I have) this return 0 or 1:

(($RANDOM%6)); echo $?

And this complains about non-existing method 4 (or 5, or 3 - this seems to be completly random ;) )

Comment by MaciejPiechotka 373 weeks and 6 days ago
perl -e '$i[0]="Hello world"; print $i[int(rand(6))], "\n";'
Comment by sputnick 373 weeks ago

Your point of view

You must be signed in to comment.