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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 egrep from sorted by
Terminal - Commands using egrep - 187 results
curl "http://api.twitter.com/1/statuses/user_timeline.xml?count=1&screen_name=barackobama" | egrep -w "<text>(.*)</text>" | sed -E "s/<\/?text>//g" | say
2012-02-27 18:46:33
User: beerdeaap
Functions: egrep sed
Tags: twitter osx say

speaks out last twitter update using 'say'

wineserver -k; killall -9 wine wineserver; for i in `ps ax|egrep "*\.exe"|grep -v 'egrep'|awk '{print $1 }'`;do kill -9 $i;done
2011-12-30 01:38:15
User: godmachine81
Functions: awk egrep grep kill killall
Tags: kill wine exe

The other 2 commands that are listed will also kill the egrep process and any libexec processes because the .exe isn't escaped so it is really using . meaning anything containing exe. The command i posted escapes the (dot) in .exe and then filters the actual egrep process so that it doesn't get killed before the other processes being killed. Also added the -9 switch for kill to send sigterm to the processes, in case people are wondering why processes aren't getting killed after running just kill . This should work better for people :)

mysql -u root -p -N -e"show processlist\G;" | egrep "Host\:" | awk -F: '{ print $2 }' | sort | uniq -c
for i in `netstat -rn|egrep -v "Interface|Routing"|awk '{print $5}'`;do ifconfig $i;done
egrep -v "^\s*(#|$)" myfile.cfg
2011-12-08 15:25:17
User: dan
Functions: egrep
Tags: egrep comment

Does not print any line that either:

- is empty

- contains only spaces or tabs

- starts with #

- starts with spaces/tabs followed by a #

resolve(){ curl -Is $1 | egrep "Location" | sed "s/Location: \(.*\)/\1/g"; }
2011-12-06 12:37:46
User: hoodie
Functions: egrep sed

since the most url shorteners respond with a header containing the Location: ... this works with most common shorteners

nocomments () { cat $1 | egrep -v '^[[:space:]]*#|^[[:space:]]*$|^[[:space:]]*;' | sed '/<!--.*-->/d' | sed '/<!--/,/-->/d'; }
2011-11-04 12:47:39
User: RuizTapiador
Functions: cat egrep sed
Tags: sed grep comment

Hide comments and empty lines, included XML comments,

function geoip() { curl -s "http://www.geoiptool.com/en/?IP=$1" | html2text | egrep --color "IP Address:|Country:|City:|Longitude:|Latitude:|Host Name:" }
2011-10-25 04:49:25
User: JohnQUnknown
Functions: egrep

Provides a cleaner output plus some more details about the IP address. Also, a flaw was corrected where the URL provided the results in Spanish by default.

portnum() { egrep "[[:space:]]$*/" /etc/services; }
lynx -dump http://www.anti-abuse.org/multi-rbl-check/ | grep ']' | awk -F\] '{ print $2 }' | sed '/^\[/d' | egrep -v ^[A-Z]
sudo ngrep -lqi -p -W none ^get\|^post tcp dst port 80 -d eth0 | egrep '(flv|mp4|m4v|mov|mp3|wmv)'
2011-09-18 06:33:36
User: marste
Functions: egrep sudo

Discover host and url of media files (ex. flv, mp4, m4v..).

It locate the urls of audio and video files so that they can be recorded.

lynx --dump "http://www.google.com.br" | egrep -o "http:.*"
2011-09-05 01:12:15
Functions: egrep

Get all URLs from website via Regular Expression... You must have lynx installed in your computer to execute the command.

--> lynx --dump "" | egrep -o ""

- Must substitute it for the website path that you want to extract the URLs

- Regular Expression that you wanna filter the website

while IFS= read -r -u3 -d $'\0' file; do file "$file" | egrep -q 'executable|ELF' && chmod +x "$file"; done 3< <(find . -type f -print0)
2011-08-18 15:37:23
User: keymon
Functions: chmod egrep file find read

If you make a mess (like I did) and you removed all the executable permissions of a directory (or you set executable permissions to everything) this can help.

It supports spaces and other special characters in the file paths, but it will work only in bash, GNU find and GNU egrep.

You can complement it with these two commands:

1. add executable permission to directories:

find . type d -print0 | xargs -0 chmod +x

2. and remove to files:

find . type d -print0 | xargs -0 chmod -x

Or, in the same loop:

while IFS= read -r -u3 -d $'\0' file; do case $(file "$file" | cut -f 2- -d :) in :*executable*|*ELF*|*directory*) chmod +x "$file" ;; *) chmod -x "$file" ;; esac || break done 3< <(find . -print0)

Ideas stolen from Greg's wiki: http://mywiki.wooledge.org/BashFAQ/020

rm -R `ls | egrep -v 'dir1|dir2|file1'`
whichpkg () { dpkg -S $1 | egrep -w $(readlink -f "$(which $1)")$; }
2011-07-17 13:39:56
User: b_t
Functions: egrep readlink
Tags: dpkg readlink

Advanced revision to the command 8776 . This revision follows symbolic links.

The quotation-marks surrounding $(which $1) allows for graceful handling of errors ( ie. readlink does not complain incase 'which' command generates (null) output)

egrep expr1\|expr2 file
egrep '(expr1|expr2)' file
2011-07-14 14:22:11
User: evandrix
Functions: egrep

to find occurances of expr1 OR expr2

egrep -in "this|that" *.dat
2011-07-06 09:42:26
User: evandrix
Functions: egrep

grep - Search file for character string

Search for one or more strings in one or more files. Examples:-

grep that myfile.txt

Look for the string ``that'' in the file called ``myfile.txt'' and print out each line that matches.

egrep -in "this|that" *.dat

Extended grep search *.dat files for ``this'' or ``that'' case insensitive (-i) and where found print line number (-n) along with the line contents.

function summpkg { dpkg -s $(dpkg -S $1 | egrep -w $(which $1)$ | awk -F: '{print $1}') ; }
2011-07-05 23:06:37
User: b_t
Functions: awk egrep which
Tags: which dpkg

This version builds on my command 8776 (Find the package a command belongs to on debian-based distros). So if you use that command to find package name then you could alternatively use following for

package summary:

function summpkg { dpkg -s $(whichpkg $1 | awk -F: '{print $1}'); }
function whichpkg { dpkg -S $1 | egrep -w $(which $1)$; }
make -d | egrep --color -i '(considering|older|newer|remake)'
2011-06-03 01:55:08
User: b_t
Functions: egrep make
Tags: make

Say your dependencies specified in your Makefile (or dates on your source files) is causing 'make' to

skip some source-files (that it should not) or on the other other end, if it is causing make to always build some source-files regardless of dates of target, then above command is handy to find out what 'make' thinks of your date v/s target date-wise or what dependencies are in make's view-point.

The egrep part removes the extra noise, that you might want to avoid.

egrep -v "^$|^#" file
watch 'netstat -anptu |egrep "^Proto|:80 "'
2011-05-18 15:05:52
User: Mozai
Functions: egrep watch

Shows updated status in a terminal window for connections to port '80' in a human-friendly form. Use 'watch -n1' to update every second, and 'watch -d' to highlight changes between updates.

If you wish for status updates on a port other than '80', always remember to put a space afterwards so that ":80" will not match ":8080".

alias screenr='screen -r $(screen -ls | egrep -o -e '[0-9]+' | head -n 1)'
egrep -ie "<*HREF=(.*?)>" index.html | cut -d "\"" -f 2 | grep ://
2011-03-29 18:20:50
User: fanfani
Functions: cut egrep grep

you can also use cut instead of awk. less powerful but probably faster. ;)