Hide

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.

Hide

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:

Hide

News

2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.
Hide

Tags

Hide

Functions

Commands using grep from sorted by
Terminal - Commands using grep - 1,565 results
GeoipLookUp(){ curl -A "Mozilla/5.0" -s "http://www.geody.com/geoip.php?ip=$1" | grep "^IP.*$1" | html2text; }
2009-11-06 00:32:27
User: sputnick
Functions: grep
Tags: sed curl
3

That makes a function you can put in your ~/.bashrc to run it when you need in any term with an IP as argument

ip link show eth0 | grep "link/ether" | awk '{print $2}'
2009-11-05 17:06:15
User: maxmanders
Functions: awk grep link
Tags: mac
0

...or for a particular interface...

grep "model name" /proc/cpuinfo
2009-11-05 05:23:30
User: getkaizer
Functions: grep
Tags: grep cpuinfo
3

Extracts the model name of the CPU and displays it on screen.

lynx --dump http://ip.boa.nu|sed -e 's/^[[:space:]]*//' -e 's/*[[:space:]]$//'|grep -v ^$
2009-11-04 22:23:45
User: xeor
Functions: grep sed
-5

For those of us that still uses lynx :)

ip link | grep 'link/ether' | awk '{print $2}'
2009-11-04 19:41:26
User: markdrago
Functions: awk grep link
Tags: mac
1

I much prefer using /sbin/ip over /sbin/ifconfig for most everything. I find the interface and output to be much more consistent and it has many abilities that ifconfig, route, etc. do not. To get the mac address for only one interface, add 'show dev [interface]' to the 'ip link' part of the command: ip link show dev eth0 | grep 'link/ether' | awk '{print $2}' . Also, both this command and the ifconfig one do not require root access to run, so the sudo is not necessary.

sudo ifconfig -a | grep eth | grep HW | cut -d' ' -f11
ps -ec -o command,rss | grep Stainless | awk -F ' ' '{ x = x + $2 } END { print x/(1024) " MB."}'
2009-11-04 19:01:22
Functions: awk grep ps
0

Adds up the total memory used by all Stainless processes: 1 Stainless, 1 StainlessManager and 1 StainlessClient per tab open.

ifconfig eth1 | grep inet\ addr | awk '{print $2}' | cut -d: -f2 | sed s/^/eth1:\ /g
2009-11-03 19:26:40
User: TuxOtaku
Functions: awk cut grep ifconfig sed
2

Sometimes, you don't really care about all the other information that ifconfig spits at you (however useful it may otherwise be). You just want an IP. This strips out all the crap and gives you exactly what you want.

for x in `find /vmfs/volumes/ -name *vmx -exec grep -H linux.iso {} \; |cut -d : -f 1`; do echo $x; grep -i sync $x; done;
2009-10-30 16:19:16
User: uid0
Functions: cut echo grep sync
0

besure to adjust your find to use to correct location of your VMX files.

for URL in `wget -O - http://api.flickr.com/services/feeds/photos_public.gne?tags=bitch,bw 2>/dev/null | grep -E -o "http[^ ]+?jpg" | grep -v "_m" | uniq | grep -v 'buddy' `; do FILE=`echo $URL | grep -E -o "[0-9a-z_]+\.jpg"`; curl $URL > $FILE; done;
find . -name '*.java' | xargs -L 1 cpp -fpreprocessed | grep . | wc -l
2009-10-29 09:58:43
User: rbossy
Functions: cpp find grep wc xargs
2

I took java to make the find command simpler and to state that it works for any language supported by cpp.

cpp is the C/C++ preprocessor (interprets macros, removes comments, inserts includes, resolves trigraphs). The -fpreprocessor option tells cpp to assume the input has already been preprocessed so it will only replace comment lines with blank lines.

The -L 1 option tells xargs to launch one process for each line, indeed cpp can only process one file at the time...

TIMEUNIT=$( cat a | grep -n "timescale" | awk -F ":" '{ print $1 } ' )
curl -s checkip.dyndns.org | grep -Eo '[0-9\.]+'
w3m miip.cl | grep ip
2009-10-26 01:40:37
User: Cont3mpo
Functions: grep
-2

See external ip with w3m, simple and fast.

On a web site from Chile (spanish).

grep test somefile | grep -v -e error -e critical -e warning
2009-10-24 15:58:11
User: pipping
Functions: grep test
2

You can use -e to pass multiple patterns.

grep 'test' somefile | grep -vE '(error|critical|warning)'
2009-10-23 23:21:36
User: zlemini
Functions: grep
16

Use multiple patterns with grep -v. So you can print all lines in a file except those containing the multiple patterns you specify.

for i in $(netstat --inet -n|grep ESTA|awk '{print $5}'|cut -d: -f1);do geoiplookup $i;done
2009-10-18 20:41:47
Functions: awk cut grep netstat
3

Sample command to obtain a list of geographic localization for established connections, extracted from netstat. Need geoiplookup command ( part of geoip package under CentOS)

x=1 ; while [ $x -le 10 ] ; do lynx -dump http://www.alexa.com/siteinfo/http://[YOUR WEBSITE] | grep Global | sed 's/ \|Global\|\,//g' >> /var/log/alexa-stats.txt ; sleep 5h ; done &
2009-10-17 13:48:05
User: felix001
Functions: grep sed sleep
0

This will record the Alexa Traffic Stats to a file and run every 5 hours.

-- www.fir3net.com --

ord () { seq 1 127 | while read i; do echo `chr $i` $i; done | grep "^$1 " | cut -c '3-' }
2009-10-16 21:54:01
User: infinull
Functions: cut echo grep read seq
0

uses the previous "chr" function and uses it to create the inverse function "ord" by brute force.

It's slow, It's inelegant, but it works.

I thought I needed ord/chr to do a cartesian cipher in shell script a whie ago, but eventualy I realized I could get fancy with tr and do the same thing...

perl -e '$i=0;while($i<10){open(WGET,qq/|xargs lynx -dump/);printf WGET qq{http://www.google.com/search?q=site:g33kinfo.com&hl=en&start=$i&sa=N},$i+=10}'|grep '\/\/g33kinfo.com\/'
2009-10-16 12:20:17
User: op4
Functions: grep perl xargs
Tags: web browser
0

not my cmd... found on the web

tail -f FILE | grep --color=always KEYWORD
h() { if [ -z "$1" ]; then history; else history | grep "$@"; fi; }
2009-10-13 21:49:37
User: haivu
Functions: grep
Tags: bash grep
6

Place this in your .bash_profile and you can use it two different ways. If you issue 'h' on its own, then it acts like the history command. If you issue:

h cd

Then it will display all the history with the word 'cd'

b="http://2010.utosc.com"; for p in $( curl -s $b/presentation/schedule/ | grep /presentation/[0-9]*/ | cut -d"\"" -f2 ); do f=$(curl -s $b$p | grep "/static/slides/" | cut -d"\"" -f4); if [ -n "$f" ]; then echo $b$f; curl -O $b$f; fi done
2009-10-11 17:28:46
User: danlangford
Functions: cut echo grep
Tags: curl cut for UTOSC
2

miss a class at UTOSC2010? need a refresher? use this to curl down all the presentations from the UTOSC website. (http://2010.utosc.com) NOTE/WARNING this will dump them in the current directory and there are around 37 and some are big - tested on OSX10.6.1

ps -ef | grep pmon
netstat -an|grep -ci "tcp.*established"
2009-10-09 01:08:18
User: romulusnr
Functions: grep netstat
3

If you want prepend/append text just wrap in echo:

echo Connected: `netstat -an|grep -ci "tcp.*established"`