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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.




Commands using awk from sorted by
Terminal - Commands using awk - 1,157 results
function garg () { tail -n 1 ${HISTFILE} | awk "{ print \$$1 }" }
2013-09-10 04:07:46
User: plasticphyte
Functions: awk tail

This gets the Nth argument in the last line of your history file. This is useful where history is being written after each command, and you want to use arguments from the previous command in the current command, such as when doing copies/moving directories etc.

I wrote this after getting irritated with having to continually type in long paths/arguments.

You could also use $_ if all you want is the last argument.

for I in $(awk -v LIMIT=500 -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd | cut -f 1-1 -d ':' | xargs); do usermod -g YOURGROUP $I ; done
host example.com | head -1 | awk '{print $4}'
nslookup www.example.com | tail -2 | head -1 | awk '{print $2}'
2013-09-05 20:26:45
User: wsams
Functions: awk head nslookup tail

I'm not sure how reliable this command is, but it works for my needs. Here's also a variant using grep.

nslookup www.example.com | grep "^Address: " | awk '{print $2}'

for i in `ip addr show dev eth1 | grep inet | awk '{print $2}' | cut -d/ -f1`; do echo -n $i; echo -en '\t'; host $i | awk '{print $5}'; done
apt-cache -n dumpavail | grep 'Package:' | awk '{print $2 }'
ipcs -q | grep foo | awk '{print $2}' | xargs -I ipcid ipcrm -q ipcid
brew cleanup -n | awk '{print $3}' | xargs du -s | awk '{s+=$1} END {print s}'
curl -s poncho.is/forecast/new_york/today/ | grep -E 'og:title|og:description' | cut -d\" -f4 | awk '{print $0,"<p>"}' | lynx -stdin -dump
tail -n 1000 access.log | grep "200 POST" | awk '{print substr($3,0,9)}' | awk '{data[$0]++}END{for(item in data){print item, data[item]}}'
du -Lsbc * |awk 'function hr(bytes){hum[1024**4]="TiB";hum[1024**3]="GiB";hum[1024**2]="MiB";hum[1024]="kiB";for(x=1024**4;x>=1024;x/=1024){if(bytes>=x){return sprintf("%8.3f %s",bytes/x,hum[x]);}}return sprintf("%4d B",bytes);}{print hr($1) "\t" $2}'
ip addr show |grep -w inet | grep -v | awk '{ print $2}'| cut -d "/" -f 2
2013-08-17 18:54:23
User: htmlgifted
Functions: awk cut grep

This command give you Just the Network Cidr Notation

output=$(ps -ef|grep -i java 2>/dev/null); for w in ${output[@]}; do if [[ $w =~ .*Xmx.* ]]; then result=$(grep -oP "[0-9]+" <<< $w); echo $result ;fi ; done| awk 'BEGIN {sum=0} {for(i=1; i<=NF; i++) sum+=$i } END {print sum}'
2013-08-13 14:04:17
User: massiverobot
Functions: awk echo grep ps
Tags: java jvm xmx

This will find all the -Xmx[BIGINT] running on a system, add them up for you and give you the total.

ipcs -s | grep apache | awk ' { print $2 } ' | xargs ipcrm sem
2013-08-12 16:29:32
User: kernel01
Functions: awk grep ipcrm ipcs xargs

Solves these pesky errors you see in the Apache log:

[Fri Jun 28 17:51:00 2013] [emerg] (28)No space left on device: Couldn't create accept lock (/monsoon/opt/apache2/logs/accept.lock.356) (5)

Naturally, can be used to get rid of other semaphores. Note: change the apache user in accordance to your ENV.

for i in `find . -name "*.jar"`; do jar -tvf $i | grep -v /$ | awk -v file=$i '{print file ":" $8}'; done > all_jars.txt
sudo tune2fs -l $(df -h / |(read; awk '{print $1; exit}')) | grep -i created
2013-08-08 15:18:09
User: thechile
Functions: awk df grep sudo tune2fs

..not guaranteed to always be accurate but fun to see how old you Linux installation is based on the root partitions file system creation date.

ip addr list | grep global | awk '{print $7"\t"$2}'
randchannelurl=$(lynx -dump http://www.tvcatchup.com/channels.html | grep watch | sed 's/^......//'| awk 'BEGIN { srand() } int(rand() * NR) == 0 { x = $0 } END { print x }') && firefox -new-window $randchannelurl
2013-08-01 10:38:10
User: dunryc
Functions: awk grep sed watch

becuase im lazy and cant be bothered looking at the tv guide to choose a channel , any improvments or comments appreciated

ifconfig | egrep [0-9A-Za-z]{2}\(:[0-9A-Za-z]{2}\){5} | awk '{print $1 ":\t" $5}'
2013-07-30 17:02:07
User: jaimeanrm
Functions: awk egrep ifconfig

Is the better option on a Open SuSE Box

curl -sL http://www.dell.com/support/troubleshooting/us/en/555/Servicetag/$(dmidecode -s system-serial-number) | html2text -style pretty | awk -F\. '/with an end date of/ { print $1 "."}'
2013-07-30 14:46:12
User: mhollick
Functions: awk date

pretty much the same.

I use awk rather than grep and perl.

It looks like the URL has been updated.

The service tag can also be retrieved via snmp - potential for a for loop over a list of servers. I might have a look into doing an example.

for m in `df -P | awk -F ' ' '{print $NF}' | sed -e "1d"`;do n=`df -P | grep "$m$" | awk -F ' ' '{print $5}' | cut -d% -f1`;i=0;if [[ $n =~ ^-?[0-9]+$ ]];then printf '%-25s' $m;while [ $i -lt $n ];do echo -n '=';let "i=$i+1";done;echo " $n";fi;done
2013-07-29 20:12:39
User: drockney
Functions: awk cut echo grep printf sed
Tags: bash

Automatically drops mount points that have non-numeric sizes (e.g. /proc). Tested in bash on Linux and AIX.

while read X ; do printf "$X --"; virsh dumpxml $X | egrep "source dev|source file"; done< <(virsh list | awk '$1 ~ /^[1-9]/ { print $2 }')
2013-07-29 17:32:59
User: hugme
Functions: awk egrep printf read

This will strip out the relivent disk information from kvm. I'm using it to find disks on a SAN which are no longer in use.

curl -s http://www.census.gov/popclock/data/population/world | awk -F'[:,]' '{print $7}'
dpkg-query --show --showformat='${Package;-50}\t${Installed-Size}\n' `aptitude --display-format '%p' search '?installed!?automatic'` | sort -k 2 -n | grep -v deinstall | awk '{printf "%.3f MB \t %s\n", $2/(1024), $1}'
2013-07-26 23:18:20
User: EvilDennisR
Functions: awk grep sort

The other commands were good, but they included packages that were installed and then removed.

This command only shows packages that are currently installed, sorts smallest to largest, and formats the sizes to be human readable.

uptime | awk -F ',' ' {print $1" "$2}'|awk ' {print $3" "$4" "$5}' | sed '1,$s/:/ /' | awk ' {if ($4 =="user") print $1*60 + $2;else if ($2=="mins") print $1;else print $1*24*60 + $2*60 + $3}'
2013-07-19 13:28:29
User: tatgren
Functions: awk sed uptime
Tags: uptime minutes

find the uptime and convert in minutes, works with AIX and Linux too