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





All commands from sorted by
Terminal - All commands - 12,274 results
less -p pattern file.txt
find . -name '*.jpg' -o -name '*.JPG' | xargs -I{} mogrify -resize 1024">" -quality 40 {}
2013-06-20 15:20:29
Functions: find xargs

First use find to find all the images that end with jpg or JPG in the current dir and all its children.

Then pipe that to xargs. The -I{} makes it so spaces in filenames don't matter.

The 1024">" makes it so it takes any image greater in dimension than 1024 and resizes them to 1024 width, but keeping aspect ratio on height.

Then it sets the image quality to 40.

Piping it through xargs means you avoid the file count limit, and you could run this on your entire file system if you wanted.

free -m
zpool create tank /path/to/file/a /path/to/file/b
2009-05-16 10:46:17
User: mnikhil
Tags: zfs zpool

This command creates an unmirrored pool using

files. While not recommended, a pool based on files can be

useful for experimental purposes.

find . -name ".svn" -type d -exec rm -rf {} \;
2012-08-16 13:04:47
User: gigo6000
Functions: find rm
Tags: svn git rm

This is useful when you are uploading svn project files to a new git repo.

ompload() { wget -O- - "$1" --quiet|curl -# -F file1=@- http://ompldr.org/upload|awk '/Info:|File:|Thumbnail:|BBCode:/{gsub(/<[^<]*?\/?>/,"");$1=$1;print}';}
2012-10-19 22:54:55
User: dzup
Functions: awk wget

Like i said, i havent test it yet, all becouse my internet its soo slow, if you try and works please share, also be nice to do it using the direct url link.

netsh interface ip dump > current-interfaces.txt
2009-02-13 15:13:05
User: piyo
Functions: dump

On Windows 2000 or newer, you can use the command line to save the current network interface info.

You can then edit the text file and re-apply it using the netsh -f command (or netsh exec). Keep a bunch of text files around to quickly switch connection info without using extra software.




rm -f `find ./ | grep "\.\_.*"`
2010-11-16 20:52:33
User: edfuh
Functions: grep rm

Mac OSX creates resource forks (http://en.wikipedia.org/wiki/Resource_fork) for every file, which are extremely annoying when transferring projects over to an Ubuntu server for instance

perl -e 'print "\n"x100'
2010-09-07 10:11:10
User: SunX
Functions: perl

Perl variant of echo several blank lines command

echo '<?php echo str_rot13 ("Hello World") ?>' > hw.php && php hw.php && rm hw.php
2011-01-04 21:15:19
User: IsraelTorres
Functions: echo rm

created and tested on:

ProductName: Mac OS X

ProductVersion: 10.6.5

BuildVersion: 10H574

ps aux| grep -v grep| grep httpd| awk {'print $2'}| xargs kill -9
export DISPLAY=$(tr '\000' '\n' < /proc/`pidof Xorg`/cmdline | egrep '^:[0-9]+')
2012-12-18 07:26:16
User: oernii2
Functions: egrep export tr

Not always does Xorg run on :0. For times like those, this script allows you to find out which it is.

perl -e '$x = []; push @$x, eval { $x = 1; return $x = 1; }'
2009-10-07 22:42:18
User: dstahlke
Functions: eval perl return

It is not easy to make perl give a segfault, but this does it. This is a known issue but apparently not easy to fix. This is completely useless except for showing people that perl is not bullet-proof.

sudo grub-install --root-directory=/media/ubuntu /dev/sda
2011-09-27 17:51:56
User: totti
Functions: sudo
Tags: grub boot fix

From live CD mount(open) the Ubuntu installed drive.

Copy the location (press Ctrl+l, Ctrl+c ) eg: /media/ubuntuuuu

Open terminal (Apllication->accessories->terminal)

Type this:

sudo grub-install --root-directory=/media/ubuntuuuu /dev/sda

(replace /media/ubuntuuuu with what u got (ie paste))

Will show success message. Now reboot

host `hostname`
2009-02-18 05:48:29
User: rommelsharma
Functions: host

This is a useful command that gives the hostname and the IP Address of your machine, on many OS. Tested on Linux and Solaris.

host command here is followed by `hostname`. Note the ` in the command is a back quote (or grave accent or back tic that usually shares the space with the ~ key). No other options are specified. See sample output.

wc -l `find . -name *.php`
echo "$(</etc/issue)"
2009-09-14 09:44:35
User: mobidyc
Functions: echo

another replacement for cat.

curl -s 'http://www.trynt.com/astrology-horoscope-api/v2/?m=2&d=23' | xmlstarlet sel -t -m '//horoscope' -v 'horoscope' | festival --tts
2009-02-23 16:52:06
User: mheadd

Uses curl, xmlstarlet and festival to speak your horoscope. Modify the m (month) and d (day) parameters to the astrology web service to hear your personal horoscope.

. filename [arguments]
2011-06-06 14:14:43
User: saibbot
Tags: shell

Read and execute commands from FILENAME in the current shell. The entries in $PATH are used to find the directory containing FILENAME. If any ARGUMENTS are supplied, they become the positional parameters when FILENAME is executed.

echo "[some repository]" | sudo tee -a /etc/apt/sources.list
2012-04-21 17:54:08
Functions: echo sudo tee

For instance, to add mongodb 10gen package

echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | sudo tee -a /etc/apt/sources.list

cd /d d:\Windows
2009-02-13 16:06:48
User: piyo
Functions: cd

In the Windows cmd.exe window, you can change the directory using cd, but if you need to go to a directory on another drive, you need to type in the drive letter and colon first (e.g. d:). With the /d on cd, you don't need this intermediate step.

cd /?

Tested on Windows XP

hostname -i
2009-04-17 21:26:56
User: kFiddle
Functions: hostname
Tags: IP hostname

I've seen some versions of hostname that don't have the -i option, so this may not work everywhere. When available, it's a better alternative than using ifconfig and wasting eyeball muscle to search for the address, and it's definitely simpler than using awk/sed.

ifconfig | awk '/inet addr/ {print $2 }' | sed 's/.*://g'
2010-03-04 08:15:08
User: Guyverix
Functions: awk ifconfig sed

Easy way to grab the IP address of a machine for easy script use. If needed a "| grep -v" at the end will suppress localhost.

dpkg -L Your_Package