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





Commands using echo from sorted by
Terminal - Commands using echo - 1,297 results
for i in `rpm -qva | sort ` ; do ; echo "===== $i =====" ; rpm -qvl $i ; done > /tmp/pkgdetails
2009-07-14 20:34:55
User: tkunz
Functions: echo rpm sort

This will create the file /tmp/pkgdetails, which will contain a listing of all the files installed on your RPM-based system (RedHat, Fedora, CentOS, etc). Useful should the RPM system/database become corrupted to find which package installed which files.

dpkg -S `which nm` | cut -d':' -f1 | (read PACKAGE; echo "[${PACKAGE}]"; dpkg -s "${PACKAGE}"; dpkg -L "${PACKAGE}") | less
2009-07-14 20:21:48
User: mohan43u
Functions: cut echo read
Tags: which dpkg

In Debian based distros, this command will list 'binutils' package details which contains 'nm' command. You can replace 'nm' to any other command.

infile=$1 for i in $(cat $infile) do echo $i | tr "," "\n" | sort -n | tr "\n" "," | sed "s/,$//" echo done
2009-07-12 21:23:37
User: iframe
Functions: cat echo sed sort tr
Tags: cat bash sort sed tr

Save the script as: sort_file

Usage: sort_file < sort_me.csv > out_file.csv

This script was originally posted by Admiral Beotch in LinuxQuestions.org on the Linux-Software forum.

I modified this script to make it more portable.

tempo=33; slope=10; maxfreq=888; function sinus { echo "s($1/$slope)*$maxfreq"|bc -l|tr -d '-'; }; for((i=1;;i++)); do beep -l$tempo -f`sinus $i`; done
2009-07-10 21:24:11
User: 5z474n
Functions: bc echo tr

Infinitely plays beeps with sinusoidally changing sound frequency. Ideal for alarm on an event.

echo -e "\e[31m"; while $t; do for i in `seq 1 30`;do r="$[($RANDOM % 2)]";h="$[($RANDOM % 4)]";if [ $h -eq 1 ]; then v="\e[1m $r";else v="\e[2m $r";fi;v2="$v2 $v";done;echo -e $v2;v2="";done;
2009-07-10 04:20:43
User: Patola
Functions: echo
Tags: color

It's the same command as submitted, but first with a command to make all characters green. It's the only way it looked "matrix-like" on my gnome-terminal.

export IFS=$(echo -e "\n")
2009-07-09 15:25:37
User: darkpand
Functions: echo export

When you use a "for" construct, it cycles on every word. If you want to cycle on a line-by-line basis (and, well, you can't use xargs -n1 :D), you can set the IFS variable to .

echo alias grep=\'grep --color=auto\' >> ~/.bashrc ; . ~/.bashrc
2009-07-05 07:44:13
User: 0x2142
Functions: alias echo
Tags: color grep

This will create a permanent alias to colorize the search pattern in your grep output

echo 2+3 |bc
2009-07-04 22:03:41
User: Kaio
Functions: echo

Handy use of bc in the command line. No need to get 'into' the bc to perform calculations

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

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

function duf { du -sk "$@" | sort -n | while read size fname; do for unit in k M G T P E Z Y; do if [ $size -lt 1024 ]; then echo -e "${size}${unit}\t${fname}"; break; fi; size=$((size/1024)); done; done; }
? () { echo "$*" | bc -l; }
2009-06-28 20:15:30
User: fizz
Functions: bc echo

defines a handy function for quick calculations from cli.

once defined:

? 10*2+3
S=`pidof skype`;grep heap /proc/$S/maps|cut -f1 -d' '|awk -F- '{print "0x" $1 " 0x" $2}'|xargs echo "du me t ">l;gdb -batch -p $S -x l>/dev/null 2>&1;strings t|grep \(smirk|head -n1
2009-06-26 20:03:17
User: alvieboy
Functions: awk cut echo grep head xargs

Skype has an internal regex which depicts the emoticons it supports. However you cannot simply search the binary file for it. This small 181 character line will do just that, provided skype is running. And of course, only works in linux.

echo "Hello World." | tee -a hello.txt
2009-06-26 00:55:59
Functions: echo tee
Tags: tee

When plumbers use pipes, they sometimes need a T-joint. The Unix equivalent to this is 'tee'. The -a flag tells 'tee' to append to the file, rather than clobbering it.

Tested on bash and tcsh.

echo "aplay path/to/song" |at [time]
2009-06-25 19:33:37
User: brausen
Functions: at echo
Tags: alarm

Set an alarm to starts in specific time.

echo "-------------" >> nicinfo.txt; echo "computer name x" >> nicinfo.txt; ifconfig | grep status >> nicinfo.txt; ifconfig | grep inet >> nicinfo.txt; ifconfig | grep ether >> nicinfo.txt; hostinfo | grep type >> nicinfo.txt;
echo $numbers | sed "s/\( \|$\)/\n/g" | sort -nu | tr "\n" " " | sed -e "s/^ *//" -e "s/ $//"
2009-06-24 15:12:17
User: chickenzilla
Functions: echo sed sort tr

You can replace "sort -nu" with "sort -u" for a word list sorted or "sort -R" for a random-sorted line

(edit: corrected)

echo "${STRING}" | tr '[A-Z]' '[a-z]' | awk '{print toupper(substr($0,1,1))substr($0,2);}'
2009-06-23 21:11:34
User: mohan43u
Functions: awk echo tr
Tags: awk tr

Helpful when we want to do mass file renaming(especially mp3s).

echo {0..1}{0..1}{0..1}{0..1}
2009-06-23 17:30:20
User: dennisw
Functions: echo

If you should happen to find yourself needing some binary numbers, this is a quickie way of doing it. If you need more digits, just add more "{0..1}" sequences for each digit you need. You can assign them to an array, too, and access them by their decimal equivalent for a quickie binary to decimal conversion (for larger values it's probably better to use another method). Note: this works in bash, ksh and zsh. For zsh, though, you'll need to issue a setopt KSH_ARRAYS to make the array zero-based.


echo ${binary[9]}
:r! echo %
2009-06-19 12:17:28
User: miccaman
Functions: echo
Tags: vim

insert filename

Normal mode: "%p

Insert mode: %

a=`printf "%*s" 16`;b=${a//?/{0..1\}}; echo `eval "echo $b"`
function my_irc { tmp=`mktemp`; cat > $tmp; { echo -e "USER $username x x :$ircname\nNICK $nick\nJOIN $target"; while read line; do echo -e "PRIVMSG $target :$line"; done < $tmp; } | nc $server > /dev/null ; rm $tmp; }
2009-06-11 22:14:48
User: Josay
Functions: cat echo read rm
Tags: netcat irc nc
command | my_irc

Pipe whatever you want to this function, it will, if everything goes well, be redirected to a channel or a user on an IRC server.

Please note that :

- I am not responsible of flood excesses you might provoke.

- that function does not reply to PINGs from the server. That's the reason why I first write in a temporary file. Indeed, I don't want to wait for inputs while being connected to the server. However, according to the configuration of the server and the length of your file, you may timeout before finishing.

- Concerning the server, the variable content must be on the form "irc.server.org 6667" (or any other port). If you want to make some tests, you can also create a fake IRC server on "localhost 55555" by using

netcat -l -p 55555

- Concerning the target, you can choose a channel (beginning with a '#' like "#chan") or a user (like "user")

- The other variables have obvious names.

mkdir phrack66; (cd phrack66; for n in {1..17} ; do echo "http://www.phrack.org/issues.html?issue=66&id=$n&mode=txt" ; done | xargs wget)
2009-06-11 21:42:42
Functions: cd echo mkdir xargs

Nice reading in the morning on the way to work, but sadly the .tar.gz for the whole issue 66 is not on phrack's website yet. So use wget to download.

echo "$(( 0x10 )) - $(( 010 )) = $(( 0x10 - 010 ))"
2009-06-08 19:35:53
User: asmoore82
Functions: echo

^Hexadecimal Ten minus Octal Ten is Eight(in Decimal).

echo "$(( 0xaf )) = $(( 0257 ))"

^Hexadecimal AF and Octal 257 are both Decimal 175.

find . -iname '*.jar' | xargs du -ks | cut -f1 | xargs echo | sed "s/ /+/g" | bc
if [ -z $(echo $var | grep [0-9]) ]; then echo "NON NUMERIC"; fi
2009-06-04 07:41:26
User: AnusJenkins
Functions: echo grep

use to execute a block of code only if $var is numeric