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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!
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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:

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Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

All commands from sorted by
Terminal - All commands - 12,352 results
[ -n "$SSH_CLIENT" ] && export DISPLAY=$(echo $SSH_CLIENT | awk '{ print $1 }'):0.0
2010-04-14 08:19:37
User: GouNiNi
Functions: awk echo export
0

In some case, you need to use remote gui on servers or simple machines and it's boring to see "cannot open display on ..." if you forgot to export your display. Juste add this line in .bashrc on remote machine. Dont forget to allow remote client on your local X server :

xhost +
for i in $(lsdev -Cc disk | grep EMC | cut -f 1 -d " " ); do if lsattr -a reserve_lock -El $i | grep -q "reserve_lock yes"; then chdev -a reserve_lock=no -l $i; fi; done
2010-05-14 11:48:39
User: keymon
Functions: cut grep lsattr
0

It will change the reserve_lock attribute to all AIX EMC disk attached.

pgrep -c cat
<ctrl+h> and <ctrl+j>
sudo usermod -a -G adm "$(whoami)"
awk '{command="echo "$2"|md5sum" ;command | getline $2; close(command);sub(/[[:blank:]].*/,"",$2); print $0}'
find . -type f |egrep '^./.*\.' |sed -e "s/\(^.*\.\)\(.*$\)/\2/" |sort |uniq
2012-11-12 17:17:55
User: dvst
Functions: egrep find sed sort
0

find files recursively from the current directory, and list the extensions of files uniquely

while read line; do export $line; done < <(cat input)
2013-03-15 08:14:04
User: dario
Functions: cat export read
0

This exports all lines of input file as environment variables, assuming each line is like these:

OH=YEAH

FU=UUUU

for i in *.CR2; do dcraw -c -a -h $i | ppmtojpeg > `basename $i CR2`JPG; echo $i done; done
2013-07-25 14:58:15
User: optyler
Functions: echo
0

This command takes all CR2 files in the current directory and convert them into JPG

/usr/bin/java -Xmx256M -XstartOnFirstThread -Dcom.android.sdkmanager.toolsdir=android-sdk/tools -classpath android-sdk/tools/lib/sdkmanager.jar:android-sdk/tools/lib/swtmenubar.jar:android-sdk/tools/lib/x86_64/swt.jar com.android.sdkmanager.Main avd
curl -s httpbin.org/ip | jq -r .origin
find . -type f -name '*.html' -exec grep -H HACKED {} \; > hacklog.txt
2009-02-16 08:57:25
User: nullrouter
Functions: find grep
0

This will check all .HTML file contents for the word "Hacked" and dump it to hacklog.txt. This is great for located all those files affected by nasty Joomla exploits. Change the .HTML to any other extension you wish to check, and of course the word "HACKED" for other searches.

cal -y | tr '\n' '|' | sed "s/^/ /;s/$/ /;s/ $(date +%e) / $(date +%e | sed 's/./#/g') /$(date +%m | sed s/^0//)" | tr '|' '\n'
for file in `find /var/log/ -type f -size +5000k`; do echo " " > $file; done
2009-07-03 16:26:36
User: jemmille
Functions: echo file
0

Empties all files in /var/log over 5000k. Useful if /var goes crazy or if you just haven't cleaned up in a while.

apt-key list
2009-09-03 19:32:11
User: 0disse0
Functions: apt
Tags: apt-key
0

For example: check the APT security keys to make sure the Google digital signature was imported correctly

perl -lne 'print for /url":"\K[^"]+/g' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q)
2009-12-14 00:51:54
User: sputnick
Functions: ls perl sed
0

If you want all the URLs from all the sessions, you can use :

perl -lne 'print for /url":"\K[^"]+/g' ~/.mozilla/firefox/*/sessionstore.js

Thanks to tybalt89 ( idea of the "for" statement ).

For perl purists, there's JSON and File::Slurp modules, buts that's not installed by default.

ping 8.8.8.8
2011-02-18 19:51:36
User: petrus
Functions: ping
0

8.8.8.8 and 8.8.4.4 are two Google public DNS.

As their address is really simple, it's easy to use this command to test if Internet is reachable.

Beware of large corporate networks however, that may use this address on router's loopbacks interfaces.

gawk 'BEGIN {RS="\n\n"; if (ARGV[1]=="-i"){IGNORECASE=1; ARGC=1}};{Text[NR]=$0};END {asort(Text);for (i=1;i<=NR;i++) printf "%s\n\n",Text[i] }' -i<Zip.txt
2011-05-10 19:08:27
User: IF_Rock
Functions: gawk printf
0

Among other things, this allows the sorting of comment descriptions and command lines retrieved as text from CommandLineFu.com.

FILE=$(tempfile 2>/dev/null || echo .$RANDOM)
2011-06-22 15:12:21
User: h3nr1x
Functions: echo
0

Another way to create temp files in your scripts, if tempfile fails, it will create a hidden local file in the current directory, don't forget to delete $FILE

lynx -dump http://example.com/ | awk '/http/{print $2}' | sort -u
2011-10-13 09:49:36
User: mathias
Functions: awk sort
Tags: awk lynx
0

This will get all links from a given URL, remove any duplicates, and output the result.

curl -s ifconfig.me|tee >(xargs geoiplookup)
2012-02-09 20:30:26
Functions: tee xargs
Tags: tee curl geoip
0

Show external IP and geolocation information.

Primary feature is the use of tee to echo IP _and_ send to geoiplookup command...Use IP as input for as many commands as you want with more >( [command] )

Thanks to http://www.commandlinefu.com/commands/view/6334/

Requires MaxMind DB and geoiplookup tool.

Sample output has IP obfuscated on first line, lines 2-4 from having MaxMind Country && MaxMind City DBs installed

grep -hor ofx[a-zA-Z]*.h src/ | grep -o ofx[^\.]* >> addons.make
wpa_passphrase "ESSID" "Password" | wpa_supplicant -Dwext -iwlan0 -c/dev/stdin&
2013-05-07 11:05:50
User: adamrights
0

If you need to hop on a wifi fast, perhaps you're fixing a system and it's read-only this command pipes the output of wpa_passphrase used to generate a .conf file and instead reads it from the standard input stream.

The -i switch for interface may not be wlan0, as udev will change it. A quick "ifconfig" or "dmesg | grep wlan0" will show you the wireless interface name.

amixer -c 0 set Master 1dB+
2013-07-25 15:28:45
User: chrisp6825
Functions: amixer set
0

adjusts the 'Master' channel's volume up by 1dB.

Can use command 'amixer' to see other channels :

Simple mixer control 'Master',0

or

Simple mixer control 'Capture',0

rvm --default use ruby-1.9.3