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 awk from sorted by
Terminal - Commands using awk - 1,163 results
history | awk '{a[$'$(echo "1 2 $HISTTIMEFORMAT" | wc -w)']++}END{for(i in a){print a[i] " " i}}' | sort -rn | head
w3m -dump_source http://www.onelinerz.net/random-one-liners/1/ | awk ' /.*<div id=\"oneliner_[0-9].*/ {while (! /\/div/ ) { gsub("\n", ""); getline; }; gsub (/<[^>][^>]*>/, "", $0); print $0}'
2010-06-02 21:15:37
User: quincymd
Functions: awk
1

Put this command in .bashrc and every time you open a new terminal a random quote will be downloaded and printed from onelinerz.net.

By altering the URL in the w3m statement you can change the output:

1 to 10 lines - http://www.onelinerz.net/random-one-liners/(number)/

20 newest lines - http://www.onelinerz.net/latest-one-liners/

Top 10 lines - http://www.onelinerz.net/top-100-funny-one-liners/

Top 10 lines are updated daily.

find / -type f -size +500000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'
top -bn 1 | awk '{if($1 ~ /^[0-9]+$/ && $9 > 97) {print $1;exit}}'|xargs kill
2010-06-02 13:51:40
User: chx
Functions: awk top xargs
-1

I found Flash eating one of my CPUs after resume, the command above will help with that. For optional kicks you can put it into a script in /etc/pm/sleep.d/ (aspect in #swhack wrote this for me)

echo '<html><body><table>' > /tmp/bar.html && find / -name '*.ogg' | sort | awk '{print "<tr><td>"$1"</td><td><audio src=\""$1"\" controls='controls'></audio></td></tr>" }' >> /tmp/bar.html && echo '</table></body></html>' >> /tmp/bar.html
2010-06-01 17:40:50
User: copremesis
Functions: awk echo find sort
2

find OGG audio files on your *nix box and listen to them using your web browser

UNIQUE_BY_MAC=$(ifconfig |grep eth0|awk '{ print strtonum("0x"substr($6,16,2)) }')
2010-06-01 17:34:43
User: rubo77
Functions: awk grep ifconfig
-3

gets the last number of the mac address to use it for other stuff

logfile=/var/log/gputemp.log; timestamp=$( date +%T );temps=$(nvidia-smi -lsa | grep Temperature | awk -F: ' { print $2 } '| cut -c2-4 | tr "\n" " ");echo "${timestamp} ${temps}" >> ${logfile}
getent passwd | awk -F: '($3>600) && ($3<10000) && ($3>maxuid) { maxuid=$3; } END { print maxuid+1; }'
awk 'BEGIN{ORS=""}NR!=1&&FNR==1{print "\n"}{print}END{print "\n"}' *.txt
2010-05-24 19:22:35
User: recursiverse
Functions: awk
-1

Problem: you want to output one line per file. you can't just 'tr -d' because you want one line per file and you don't want to use a loop.

Solution: use awk to print each line without the record separator and a newline after each file.

utime(){ awk -v d=$1 'BEGIN{print strftime("%a %b %d %H:%M:%S %Y", d)}'; }
find / -type f -size +512000 | xargs ls -lh | awk '{ print $5 " " $6$7 ": " $9 }'
2010-05-12 17:21:12
User: johnss
Functions: awk find ls xargs
-1

This is an updated version that some one provided me via another "find" command to find files over a certain size. Keep in mind you may have to mess around with the print values depending on your system to get the correct output you want. This was tested on FC and Cent based servers. (thanks to berta for the update)

awk '(length>t) {t=length} END {print t}' *.cpp
ping -c 2 `arp-scan 10.1.1.0/24 | awk '/00:1b:11:dc:a9:65/ {print $1}'`
2010-05-11 13:12:43
User: voyeg3r
Functions: awk ping
4

# first install arp-scan if not have it

arp-scan 10.1.1.0/24 .... show ip+mac in localnet

awk '/00:1b:11:dc:a9:65/ {print $1}' .... get ip associated with MAC

` backtick make do command substitution passing ip to command ping

tail -n2000 /var/www/domains/*/*/logs/access_log | awk '{print $1}' | sort | uniq -c | sort -n | awk '{ if ($1 > 20)print $1,$2}'
awk -F: '{uid[$3]=1}END{for(x=500; x<=600; x++) {if(uid[x] != ""){}else{print x; exit;}}}' /etc/passwd
2010-05-10 18:10:51
User: UnixSage
Functions: awk
2

Typical usage would be in a script that would want the next open UID in a range (in this case 500-600)

changing_assets = `s3cmd sync --dry-run -P -M --exclude=*.php --delete-removed #{preprod_release_dir}/web/ #{s3_bucket} | grep -E 'delete:|upload:' | awk '{print $2}' | sed s_#{preprod_release_dir}/web__`
2010-05-07 16:03:42
User: trivoallan
Functions: awk grep sed sync
2

Can be useful to granulary flush files in a CDN after they've been changed in the S3 bucket.

netstat -an | awk '/tcp/ {print $6}' | sort | uniq -c
2010-05-06 17:04:37
User: Kered557
Functions: awk netstat sort uniq
1

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

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

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.

history | awk '{a[$'$(echo "1 2 $HISTTIMEFORMAT" | wc -w)']++}END{for(i in a){print a[i] " " i}}' | sort -rn | head
2010-05-02 21:48:53
User: bandie91
Functions: awk echo sort wc
Tags: history awk wc
0

If you use HISTTIMEFORMAT environment e.g. timestamping typed commands, $(echo "1 2 $HISTTIMEFORMAT" | wc -w)

gives the number of columns that containing non-command parts per lines.

It should universify this command.

zenity --list --width 500 --height 500 --column 'radio' --column 'url' --print-column 2 $(curl -s http://www.di.fm/ | awk -F '"' '/href="http:.*\.pls.*96k/ {print $2}' | sort | awk -F '/|\.' '{print $(NF-1) " " $0}') | xargs mplayer
2010-04-28 23:45:35
User: polaco
Functions: awk sort xargs
15

This is a very simple and lightweight way to play DI.FM stations

For a more complete version of the command with proper strings in the menu, try: (couldnt fit in the command field above)

zenity --list --width 500 --height 500 --title 'DI.FM' --text 'Pick a Radio' --column 'radio' --column 'url' --print-column 2 $(curl -s http://www.di.fm/ | awk -F '"' '/href="http:.*\.pls.*96k/ {print $2}' | sort | awk -F '/|\.' '{print $(NF-1) " " $0}') | xargs mplayer

This command line parses the html returned from http://di.fm and display all radio stations in a nice graphical menu. After the radio is chosen, the url is passed to mplayer so the music can start

dependencies:

- x11 with gtk environment

- zenity: simple app for displaying gtk menus (sudo apt-get install zenity on ubuntu)

- mplayer: simple audio player (sudo apt-get install mplayer on ubuntu)

ps aux |awk '{$1} {++P[$1]} END {for(a in P) if (a !="USER") print a,P[a]}'
2010-04-28 15:25:18
User: benyounes
Functions: awk ps
5

enumerates the number of processes for each user.

ps BSD format is used here , for standard Unix format use : ps -eLf |awk '{$1} {++P[$1]} END {for(a in P) if (a !="UID") print a,P[a]}'

find -name `egrep -s '.' * | awk -F":" '{print $1}' | sort -u` -exec stat {} \;
2010-04-26 20:01:44
Functions: awk find sort stat
1

This will run stat on each file in the directory.

netstat -n | awk '/^tcp/ {++B[$NF]} END {for(a in B) print a, B[a]}'
find ./ -name *.h -exec egrep -cH "// | /\*" {} \; | awk -F':' '{print $2 ":" $1}' | sort -gr
2010-04-23 19:00:07
User: blocky
Functions: awk egrep find sort
1

This shows you which files are most in need of commenting (one line of output per file)

/sbin/ifconfig|grep -B 1 inet |head -1 | awk '{print $5}'