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commandlinefu.com is the place to record those command-line gems that you return to again and again.

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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

All commands from sorted by
Terminal - All commands - 12,364 results
find . -maxdepth 1 -iname '*jpg' -exec convert -quality 60 {} lowQ/{} \;
2009-02-15 19:34:38
User: abhinay
Functions: find

* lowQ/ is the output directory

* pass quality level from 1 to 100

echo "import random; print(random.choice(['heads', 'tails']))" | python
convert -bordercolor Transparent -border 1x1 in.png out.png
2009-02-15 19:42:17
User: jimmac

Requires either imagemagick or graphicsmagic utility.

/usr/local/bin/OFPW -pass thepassword
while read str; do echo "$((++i)) - $str"; done < infile
2009-12-09 15:11:25
User: putnamhill
Functions: echo read
Tags: bash

Hi glaudiston, you can save a few chars by leaving out cat and pipe and still enjoy the added flexibility.

tw translate.google.com.de-en `xsel`
2010-06-11 22:28:28
User: dbbolton

Translate the X selection from German to English. The tw program is available from Savannah: http://mirror.its.uidaho.edu/pub/savannah/twandgtw/

I'm posting this because the base Debian system also does not include curl.

/usr/local/bin/OFPW -mode 1
perl -wlne 'print $1 if /(([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5]))/' iplist
2009-09-17 16:14:52
User: salparadise
Functions: perl

if you want to only print the IP address from a file.

In this case the file will be called "iplist" with a line like "ip address"

it will only print the "" portion

2011-05-02 14:44:41
User: Nbeker

Learning cardinal and ordinal numbers in Spanish, with the best sounds files, try to get the best way to improve youLearning cardinal and ordinal numbers in Spanish, with the best sounds files, try to get the best way to improve your vocabulary.

xpath () { xmllint --format --shell "$2" <<< "cat $1" | sed '/^\/ >/d' }
2011-12-20 08:34:11
User: sharfah
Functions: sed
Tags: xml xmllint xpath

This function uses xmllint to evaluate xpaths.

Usage: xpath /path/to/element XMLfile

copy /b part.1 + part.2 + part.n file.extension
echo | egrep -e '^(([01]?[0-9]{1,2}|2[0-4][0-9]|25[0-4])\.){3}([01]?[0-9]{1,2}|2[0-4][0-9]|25[0-4])$'
2009-09-17 17:40:48
User: arcege
Functions: echo egrep

Handles everything except octets with 255. Ran through ip generator with variable octet lengths.

sudo usermod -p $(mkpasswd '') user_id
2010-05-06 20:39:58
User: ckclark
Functions: sudo usermod

It is safe when there is

"PermitEmptyPasswords no"

in /etc/ssh/sshd_config.

This command is useful when there is no need to have a password.

awk '{print $0/60;}' /proc/uptime
2011-08-31 10:41:21
User: ioggstream
Functions: awk

Get info directly from /proc/uptime

ssh -XfC -c blowfish [email protected] Xephyr dpms -fullscreen -query localhost :5
2012-11-01 18:59:57
User: hute37
Functions: ssh
Tags: ssh X Xephyr xdmcp

ssh compresion -C option ...

on slow connection VNC performs better but in local LAN native secure X protocol is an option

curl curlmyip.com
%s/?/\&iuml;/ge | %s/?/\&#0233;/ge | %s/?/"/ge | %s/?/"/ge | %s/?/'/ge | %s/?/'/ge | %s/?/\&ecirc;/ge | %s/?/\&#0133;/ge | %s/?/\&#232;/ge | %s/?/\&#243;/ge | %s/?/\&ouml;/ge | %s/?/\&#0233;/ge | %s/?/\&ndash;/ge | %s/?/\&mdash;/ge
2010-07-15 07:40:45
User: miccaman
Tags: vim

a brief list of very common special characters in Dutch. Usefull for formatting Word source to html.

find ./ -iname "*.mp3" -type f -printf "mv '%p' '%p'\n" | sed -e "s/mp3'$/mp3'/I" | sh
2009-03-27 13:42:40
User: jnash
Functions: find sed

Extensible to other ugly extensions like *.JPG, *.Jpg etc..

Leave out the last pipe to sh to perform a dry run.

for i in {0..1}{0..9}; do echo $i; done
2009-09-18 02:51:12
User: dennisw
Functions: echo
Tags: bash strings

Bash 4 will let you do {00..19} to get leading zeros, but Bash 3 doesn't have that feature. This technique gets you partway there (the sequences need be such that the last digit ranges from zero to nine - you can't use this for something like Bash 4's {03..27}, for example). When this limitation is not a problem, you can avoid some complicated string manipulation for concatenating leading zeros.

You can add more digits like this: {0..1}{0..9}{0..9} (ranges from 0 to 99 with up to two leading zeros). To pad with additional zeros:

for i in 000{0..1}{0..9}; do echo $i; done


for i in {0..1}{0..9}; do echo "000$i"; done

This is useful for creating values to sort or for creating filenames with a fixed format. Note that this will also work:

touch {0..1}{0..9}
gst-launch avimux name=mux ! filesink location=out.avi \ alsasrc ! audioconvert ! queue ! mux. istximagesrc name=videosource use-damage=false ! video/x-raw-rgb,framerate=10/1 ! videorate ! ffmpegcolorspace ! video/x-raw-yuv,framerate=10/1 ! mux.
2010-07-15 09:39:51
User: Nicolargo

The command generate an huge output file (depending on screen resolution and time).

pbzip2 -dck <bz2file> | tar xvf -
jda() { cd $(pwd | sed "s/\(\/$@\/\).*/\1/g"); }
find . -type f \( -name "*.js" -o -name "*.php" -o -name "*.inc" -o -name "*.html" -o -name "*.htm" -o -name "*.css" \) -exec grep -il 'searchString' {} \;
2010-02-07 15:28:20
User: niels_bom
Functions: find grep
Tags: find grep search

Use find to recursively make a list of all files from the current directory and downwards. The files have to have an extension of the ones listed. Then for every file found, grep it for 'searchString', returns the filename if searchString is found.