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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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Commands using grep from sorted by
Terminal - Commands using grep - 1,632 results
define(){ local y="$@";curl -sA"Opera" "http://www.google.com/search?q=define:${y// /+}"|grep -Po '(?<=<li>)[^<]+'|nl|perl -MHTML::Entities -pe 'decode_entities($_)' 2>/dev/null;}
2010-01-29 05:01:11
User: eightmillion
Functions: grep perl

This function takes a word or a phrase as arguments and then fetches definitions using Google's "define" syntax. The "nl" and perl portion isn't strictly necessary. It just makes the output a bit more readable, but this also works:

define(){ local y="$@";curl -sA"Opera" "http://www.google.com/search?q=define:${y// /+}"|grep -Po '(?<=<li>)[^<]+';}

If your version of grep doesn't have perl compatible regex support, then you can use this version:

define(){ local y="$@";curl -sA"Opera" "http://www.google.com/search?q=define:${y// /+}"|grep -Eo '<li>[^<]+'|sed 's/<li>//g'|nl|perl -MHTML::Entities -pe 'decode_entities($_)' 2>/dev/null;}
for i in `netstat -rn |grep lan |cut -c55-60 |sort |uniq`; do ifconfig $i; done
2010-01-28 17:35:20
User: Kaio
Functions: cut grep ifconfig sort

HP UX doesn't have a -a switch in the ifconfig command.

This line emulates the same result shown in Solaris, AIX or Linux

a="www.commandlinefu.com";b="/index.php";for n in $(seq 1 7);do echo -en "GET $b HTTP/1.0\r\nHost: "$a"\r\n\r\n" |nc $a 80 2>&1 |grep Set-Cookie;done
2010-01-28 14:19:43
User: vlan7
Functions: echo grep seq
Tags: bash cookies

The loop is to compare cookies. You can remove it...

Maybe you wanna use curl...

curl www.commandlinefu.com/index.php -s0 -I | grep "Set-Cookie"
find directory/ -exec grep -ni phrase {} +
2010-01-28 12:15:24
User: sanmiguel
Functions: find grep
Tags: find grep

The difference between this and the other alternatives here using only grep is that find will, by default, not follow a symlink. In some cases, this is definitely desirable.

Using find also allows you to exclude certain files, eg

find directory/ ! -name "*.tmp" -exec grep -ni phrase {} +

would allow you to exclude any files .tmp files.

Also note that there's no need for calling grep recursively, as find passes each found file to grep.

ipcs -a | grep 0x | awk '{printf( "-Q %s ", $1 )}' | xargs ipcrm
svn add $(svn st|grep ^\?|cut -c2-)
2010-01-28 09:48:46
User: inkel
Functions: cut grep
Tags: bash svn grep cut

This version makes uses of Bash shell expansion, so it might not work in all other shells.

svn status |grep '\?' |awk '{print $2}'| parallel -Xj1 svn add
2010-01-28 08:47:54
Functions: awk grep
Tags: xargs parallel

xargs deals badly with special characters (such as space, ' and "). To see the problem try this:

touch important_file

touch 'not important_file'

ls not* | xargs rm

Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

grep -rl oldstring . | parallel sed -i -e 's/oldstring/newstring/'
2010-01-28 08:44:16
Functions: grep sed

xargs deals badly with special characters (such as space, ' and "). To see the problem try this:

touch important_file

touch 'not important_file'

ls not* | xargs rm

Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

grep -E '^(cn|mail):' file.ldif | sed -e 's/^[a-z]*: //'
find filepath -type f -iname "*.html" -o -iname "*.htm" -o -iname "*.php" | xargs grep "Exception\|LGPL\|CODE1"
mgc() { grep --exclude=cscope* --color=always -rni $1 . |perl -pi -e 's/:/ +/' |perl -pi -e 's/^(.+)$/vi $1/g' |perl -pi -e 's/:/ /'; }
2010-01-26 17:00:01
Functions: grep perl

This is a big time saver for me. I often grep source code and need to edit the findings. A single highlight of the mouse and middle mouse click (in gnome terminal) and I'm editing the exact line I just found. The color highlighting helps interpret the data.

grep -rni string dir
2010-01-26 16:34:06
Functions: grep

Print line numbers also, so you don't have to search through the files once its open for the string you already grepped for.

grep -r -i "phrase" directory/
2010-01-26 16:27:00
User: TheFox
Functions: grep

-R, -r, --recursive

Read all files under each directory, recursively; this is equivalent to the -d recurse option.

for host in $(cat ftps.txt) ; do if echo -en "o $host 21\nquit\n" |telnet 2>/dev/null |grep -v 'Connected to' >/dev/null; then echo -en "FTP $host KO\n"; fi done
2010-01-26 15:34:18
User: vlan7
Functions: cat echo grep host telnet

I must monitorize a couple of ftp servers every morning WITHOUT a port-scanner

Instead of ftp'ing on 100 ftp servers manually to test their status I use this loop.

It might be adaptable to other services, however it may require a 'logout' string instead of 'quit'.

The file ftps.txt contains the full list of ftp servers to monitorize.

find directory/ |xargs grep -i "phrase"
ls /usr/bin | xargs whatis | grep -v nothing | less
2010-01-26 12:59:47
User: michelsberg
Functions: grep ls whatis xargs

no loop, only one call of grep, scrollable ("less is more", more or less...)

if [ $(synclient -l | grep TouchpadOff | awk '{print $3}') = "2" ]; then synclient TouchpadOff=1; elif [ $(synclient -l | grep TouchpadOff | awk '{print $3}') == "1" ]; then synclient TouchpadOff=2; else synclient TouchpadOff=2; fi
2010-01-26 07:52:55
User: GinoMan2440
Functions: awk grep

This command toggles the touchpad on and off, when it's on, the right side scroll strip (annoying) and the tap-clicking are disabled, you can change this by changing occurances of 2 in the command to 0. this whole command can then be given a keyboard shortcut so that the touchpad is disableable without using a special fn key (which linux doesn't recognize on some computers) or a seperate button.

for i in $(ls /usr/bin); do whatis $i | grep -v nothing; done | more
dpkg -l | grep ^rc | awk '{print $2}' | sudo xargs dpkg -P
find . -type f -exec stat \{\} \; | grep Modify: | awk '{a[$2]++}END{for(i in a){print i " : " a[i] }}' | sort
fping -r1 -g <subnet> 2> /dev/null | grep unreachable | cut -f1 -d' '
curl -u <username> http://app.boxee.tv/api/get_queue | xml2 | grep /boxeefeed/message/description | awk -F= '{print $2}'
2010-01-20 16:17:19
User: Strawp
Functions: awk grep
Tags: curl xml boxee

Might be able to do it in less steps with xmlstarlet, although whether that would end up being shorter overall I don't know - xmlstarlet syntax confuses the heck out of me.

Prompts for your password, or if you're a bit mental you can add your password into the command itself in the format "-u user:password".

sqlite3 -list /home/$USER/.mozilla/firefox/*.default/places.sqlite 'select url from moz_places ;' | grep http
2010-01-18 15:25:00
User: bubo
Functions: grep

if firefox is running the database is locked, so you need to copy the places.sqlite file temporarily somewhere to be able to query it...

find . -exec grep -l "sample" {} \;
2010-01-16 13:12:52
User: whoami
Functions: find grep

Will find all files containing "sample" in the current directory and in the directories below.

find . -name "*.php" -exec grep -il searchphrase {} \;
2010-01-16 05:09:30
Functions: find grep

This is very similar to the first example except that it employs the 'exec' argument of the find command rather than piping the result to xargs. The second example is nice and tidy but different *NIXs may not have as capable a grep command.