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.

OpenID
or
Sign in Register

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

World cup college
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

2010-03-18 - Top 10 commands explained
There's a great article by Peteris Krumins explaining the current top 10 commands: http://www.catonmat.net/blog/top-ten-one-liners-from-commandlinefu-explained/
2010-03-03 - Commandlinefu @ SXSW 2010
Am going to be at SXSW this year, in case you want to submit any CLI nuggets or suggestions to me in person. Ping me on the @codeinthehole Twitter account.
2009-09-12 - Email updates now available
You can now enable email updates to let you know each time you're command is commented on.
2009-07-11 - API and javascript blog widget now available
A simple API has been released, allowing commands to be retrieved in various formats. This also allows commands to be embedded on blogs/homepages.
Hide

Tags

Hide

Functions

Hide

Credits

Site by David Winterbottom (user root).

Commands tagged awk

Commands tagged awk from sorted by
Terminal - Commands tagged awk - 117 results
man $(/bin/ls /bin | awk '{ cmd[i++] = $0 } END { srand(); print cmd[int(rand()*length(cmd))]; }')
2010-08-20 17:31:02
User: emilsit
Functions: awk man
Tags: man awk
-5
Up
Down
Display a random man page

Build an awk array with all commands and then select a random one at the end.

This avoids spawning extra processes for counting with wc or generating random numbers.

Explicitly call /bin/ls to avoid interactions with aliases.

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
dir="/bin"; man $(ls $dir |sed -n "$(echo $(( $RANDOM % $(ls $dir |wc -l | awk "{ print $1; }" ) + 1 )) )p")
2010-08-20 16:31:50
User: camocrazed
Functions: dir ls man sed
Tags: man sed awk echo wc
-2
Up
Down
Display a random man page

Broaden your knowledge of the utilities available to you in no particular order whatsoever! Then use that knowledge to create more nifty one-liners that you can post here. =p

Takes a random number modulo the number of files in $dir, prints the filename corresponding to that number, and passes it as an argument to man.

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
svn status | grep "^\?" | awk '{print $2}' | xargs svn add
2010-08-14 18:56:15
User: kureikain
Functions: awk grep xargs
Tags: svn awk grep
1
Up
Down
Readd all files is missing from svn repo

When working on a big proeject with SVN, you create quite much files, for now! Can just sit here and type svn add for all of them!

svn status will return a list of all of file which get ?(not add), "M"(Modified), "D"(Deleted)! This code just grep "?" flag, then add it into SVN again!

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
seq 8 | awk '{print "e(" $0 ")" }' | bc -l
2010-08-14 02:52:39
User: polar
Functions: awk bc seq
Tags: awk seq bc
0
Up
Down
Generate trigonometric/log data easily

If you want a sequence that can be plotted, do:

seq 8 | awk '{print "e(" $0 ")" }' | bc -l | awk '{print NR " " $0}'

Other bc functions include s (sine), c (cosine), l (log) and j (bessel). See the man page for details.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl -sL 'www.commandlinefu.com/commands/random' | awk -F'</?[^>]+>' '/"command"/{print $2}'
2010-08-13 11:42:42
User: putnamhill
Functions: awk
Tags: awk curl random
0
Up
Down
command line fu roulette

Splitting on tags in awk is a handy way to parse html.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
svn st | grep -e '^M' | awk '{print $2}' | xargs svn revert
2010-08-11 14:24:05
User: ethanmiller
Functions: awk grep xargs
Tags: svn awk xargs grep
0
Up
Down
Revert all modified files in an SVN repo
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ip route | awk '/default/{print $3}'
2010-08-10 21:16:40
User: rthemocap
Functions: awk route
Tags: awk gateway
0
Up
Down
Find default gateway
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
netstat -rn | awk '/UG/{print $2}'
2010-08-09 15:56:02
User: putnamhill
Functions: awk netstat
Tags: awk netstat gateway
-1
Up
Down
Find default gateway

Tested on CentOS, Ubuntu, and MacOS.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
lsof /dev/snd/pcm*p /dev/dsp | awk ' { print $2 }' | xargs kill
2010-07-23 20:24:16
User: alustenberg
Functions: awk xargs
Tags: awk flash xargs kill sound lsof alsa
2
Up
Down
give me back my sound card

for when a program is hogging the sound output. finds, and kills. add -9 to the end for wedged processes. add in 'grep ^program' after lsof to filter.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
awk '$1~/^DocumentRoot/{print $2}' /etc/apache2/sites-available/default
2010-07-22 14:33:58
User: cicatriz
Functions: awk
Tags: awk apache httpd
0
Up
Down
How To Get the Apache Document Root
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
awk 'NR==linenumber' filename
2010-07-06 05:17:29
User: rajarshi
Functions: awk
Tags: awk oneliner
-4
Up
Down
It outputs a given line from a file
Comments (4) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl -s "http://www.socrata.com/api/views/vedg-c5sb/rows.json?search=Axelrod" | grep "data\" :" | awk '{ print $17 }'
2010-07-01 23:54:54
User: mheadd
Functions: awk grep
Tags: awk grep curl
0
Up
Down
Find the annual salary of any White House staffer.

Query the Socrata Open Data API being used by the White House to find any employee's salary using curl, grep and awk.

Change the value of the search parameter (example uses Axelrod) to the name of any White House staffer to see their annual salary.

Show sample output | Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ifconfig eth0 | awk '/inet / {print $2}' | cut -d ':' -f2
2010-06-30 08:52:01
User: mrwill
Functions: awk cut ifconfig
Tags: ifconfig awk grep cut
0
Up
Down
Get IPv4 of eth0 for use with scripts
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
wget -O - http://www.commandlinefu.com/commands/browse/rss 2>/dev/null | awk '/\s*<title/ {z=match($0, /CDATA\[([^\]]*)\]/, b);print b[1]} /\s*<description/ {c=match($0, /code>(.*)<\/code>/, d);print d[1]} ' | grep -v "^$"
2010-06-29 16:22:03
User: nikunj
Functions: awk grep wget
Tags: awk grep meta
0
Up
Down
Echo the latest commands from commandlinefu on the console

A Quick variation to the latest commands list with the new-lines skipped. This is faster to read.

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ifconfig eth0 | grep "inet " | cut -d ':' -f2 | awk '{print $1}'
2010-06-29 00:06:08
User: jaimerosario
Functions: awk cut grep ifconfig
Tags: ifconfig awk grep cut
2
Up
Down
Get IPv4 of eth0 for use with scripts

I've been using it in a script to build from scratch proxy servers.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ac -d | awk '{h=int($NF); m=($NF-h)*60; s=int((m-int(m))*60); m=int(m); print $0" = "h"h "m"m "s"s "}'
2010-06-24 08:08:41
User: karpoke
Functions: awk
Tags: awk ac
-1
Up
Down
print statistics about users' connect time

'ac' is included in the package 'acct', which is described as "The GNU Accounting utilities for process and login accounting". Other interesting flags are:

* print statistics for a specified user

ac -d username

* print statistics for all the users

ac -p

With my command, the output is also printed in a sexagesimal, more readable, style.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
vimlint(){ eval $(xmllint --noout "$1" 2>&1 | awk -F: '/parser error/{print "vim \""$1"\" +"$2; exit}'); }
2010-06-23 15:55:02
User: putnamhill
Functions: awk eval
Tags: vim awk eval xmllint
0
Up
Down
Edit a file in vim (at the first error) if it is not well formed xml.

Validate a file using xmllint. If there are parser errors, edit the file in vim at the line of the first error.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
svn st | awk '{if ($1 ~ "?") print $2}' | xargs svn add
2010-06-19 03:07:26
User: sciurus
Functions: awk xargs
Tags: svn awk
1
Up
Down
Add all unversioned files to svn

No need for grep, let awk do the match. This will not behave properly if the filenames contains whitespace, which is awk's default field separator.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
aptitude remove $(dpkg -l|egrep '^ii linux-(im|he)'|awk '{print $2}'|grep -v `uname -r`)
2010-06-10 21:23:00
User: dbbolton
Functions: awk egrep grep
Tags: Debian Linux awk grep kernel dpkg aptitude
8
Up
Down
Remove all unused kernels with apt-get

This should do the same thing and is about 70 chars shorter.

Show sample output | Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sudo lvdisplay |awk '/LV Name/{blockdev=$3} /Block device/{bdid=$3; sub("[0-9]*:","dm-",bdid); print bdid,blockdev;}'
2010-06-10 11:50:31
User: unixmonkey10270
Functions: awk sudo
Tags: awk lvm
1
Up
Down
Show DeviceMapper names for LVM Volumes (to disambiguate iostat logs, etc)

Emits the device names which will be printed by iostat for an LVM volume; doesn't show the names for the underlying devices when snapshots are being used (the -cow and -real devices in /dev/mapper)

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
fbemailscraper YourFBEmail Password
2010-05-26 20:52:29
User: coast
Tags: bash awk curl facebook
-9
Up
Down
Facebook Email Scraper
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
awk '(length>t) {t=length} END {print t}' *.cpp
2010-05-11 20:51:55
User: putnamhill
Functions: awk
Tags: awk
2
Up
Down
Length of longest line of code

Here's an awk version.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
tail -n2000 /var/www/domains/*/*/logs/access_log | awk '{print $1}' | sort | uniq -c | sort -n | awk '{ if ($1 > 20)print $1,$2}'
2010-05-10 19:08:37
User: allrightname
Functions: awk sort tail uniq
Tags: bash sort awk uniq tail IP apache
2
Up
Down
Count number of hits per IP address in last 2000 lines of apache logs and print the IP and hits if hits > 20
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
netstat -an | awk '/tcp/ {print $6}' | sort | uniq -c
2010-05-06 17:04:37
User: Kered557
Functions: awk netstat sort uniq
Tags: sort awk uniq netstat
1
Up
Down
Count TCP States From Netstat

Counts TCP states from Netstat and displays in an ordered list.

Show sample output | Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
echo "Keyword?";read keyword;query="http://www.shoutcast.com/sbin/newxml.phtml?search="$keyword"";curl -s $query |awk -F '"' 'NR <= 4 {next}NR>15{exit}{sub(/SHOUTcast.com/,"http://yp.shoutcast.com/sbin/tunein-station.pls?id="$6)}{print i++" )"$2}'
2010-05-03 00:44:10
User: benyounes
Functions: awk echo
Tags: awk curl
4
Up
Down
Search shoutcast web radio by keyword

Searches for web radio by submitted keyword and returns the station name and the link for listing .

May be enhanced to read user's selection and submit it to mplayer.

Show sample output | Comments (3) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate