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.

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



Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

prints line numbers

Terminal - prints line numbers
perl -pe 'print "$. "' <file>
2009-12-08 16:11:51
User: sputnick
Functions: perl
prints line numbers

No need $_ netp ;)


There are 8 alternatives - vote for the best!

Terminal - Alternatives
cat -n
ls | sed "/^/=" | sed "N;s/\n/. /"
2010-01-06 16:00:39
User: glaudiston
Functions: ls sed

the sed way to print line numbers

grep -n "^" <filename>
2010-01-07 14:54:29
User: JohnGH
Functions: grep

If you don't have nl on your system, this achieves a similar effect, the default behavior in nl is to not number blank lines, but this does.

perl -e 'use strict; use warnings; my $c; my $file = $ARGV[0]; open my $handle, "<", $file or die "$0: $file: $!\n"; while (<$handle>) { print $c++, " " x 5, $_; } close($handle);' <FILE>
2009-12-09 16:07:14
User: sputnick
Functions: perl

This is a joke for @putnamhill and @glaudiston

I'm pretty sure we can write longer if we want ;)

Know a better way?

If you can do better, submit your command here.

What others think

Or with grep glaudiston :

grep -n . <file>
Comment by sputnick 358 weeks and 6 days ago

sputnick, your syntax is a half of my in cost.


time { grep ".*" infile.csv > tmp ; }

real 0m0.731s

user 0m0.428s

sys 0m0.028s

time { grep -n . infile.csv > tmp ; }

real 0m0.304s

user 0m0.072s

sys 0m0.024s

Comment by glaudiston 358 weeks and 6 days ago

glaudiston, try that

fgrep -n . <file>

It's faster ;)

Comment by sputnick 358 weeks and 6 days ago

sputnick, did not worked for me:

fgrep -n . infile.txt cat infile.txt







Comment by glaudiston 358 weeks and 6 days ago

Which OS/Distro do you use ?

I'm under Archlinux

Comment by sputnick 358 weeks and 6 days ago
uname -a

Linux ubuntu 2.6.28-16-generic #55-Ubuntu SMP Tue Oct 20 19:48:24 UTC 2009 i686 GNU/Linux

grep --version

GNU grep 2.5.3

Comment by glaudiston 358 weeks and 6 days ago
grep --version

GNU grep 2.5.4

Comment by sputnick 358 weeks and 6 days ago

Your point of view

You must be signed in to comment.