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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

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Terminal - All commands - 12,420 results
/sbin/ifconfig | awk -F'[ :]+' '/inet addr/{print $4}'
2009-07-21 14:18:17
User: inof
Functions: awk

That one works on Linux. On BSD and Solaris, the ifconfig output is much easier to parse:

/sbin/ifconfig -a | awk '/inet/{print $2}'
grep $'\t' file.txt
find ~/.thunderbird/*.default/ -name *.msf -print0 | xargs --no-run-if-empty -0 rm;
find . -name .svn -type d -exec rm -rf {} \;
2010-12-15 18:51:08
Functions: find rm

Removing .svn directories without a pipe

dc -e '6k2vp'
mkdir -p temp && for f in *.pdf ; do qpdf --password=YOURPASSWORDHERE --decrypt "$f" "temp/$f"; done && mv temp/* . && rm -rf temp
2013-06-25 18:41:51
Functions: mkdir mv rm

Replace YOURPASSWORDHERE with the pdf password. [qpdf needed]

ls \\someserver\c$\inetpub\wwwroot -r -i web.config | Select-String "SomeMachineName"
2009-03-25 22:36:58
User: cbilson
Functions: ls

Finds all files of a certain name and reports all line with the string. Very simple.

/sbin/ifconfig | grep inet | cut -f 2 -d ":" | cut -f 1 -d " "
2009-07-21 21:42:04
User: random_bob
Functions: cut grep

another way to output the IP address' of the system

sensible-browser http://www.pythonchallenge.com/pc/def/$(bc <<< 2^38).html
2010-02-02 00:53:18
User: kzh
Functions: bc

This is the answer to the 0th problem from the python challenge < http://www.pythonchallenge.com/ >. Replace sensible-browser with firefox, w3m or whatever.

watch -n1 echo
montage input.jpg -auto-orient -duplicate 7 -geometry 500 -frame 5 output.jpg
2011-06-09 14:03:01
User: anthony

Yes, You could do it in the GIMP or even use Inkscape, but the command line is so much easier.

This is a new version of a previous command fixing some things complained about.

help shopt
kill -9 $(pidof *program*)
grep -c '^From ' mbox_file
crontab -l | sed -e '$G;$s-$-'"$CRON_MINS $CRON_HOUR"' * * * /usr/bin/command >/dev/null 2>&1-' | crontab -
2010-01-07 11:00:05
User: JohnGH
Functions: crontab sed

I needed to add a line to my crontab from within a script and didn't want to have to write my own temporary file.

You may find you need to reload the crond after this to make the change take effect.


if [ -x /sbin/service ]


/sbin/service crond reload


CRON_PID=`ps -furoot | awk '/[^a-z]cron(d)?$/{print $2}'`

if [ -n "$CRON_PID" ]





The reason I had CRON_HOUR and CRON_MINS instead of numbers is that I wanted to generate a random time between midnight & 6AM to run the job, which I did with:

CRON_HOUR=`/usr/bin/perl -e 'printf "%02d\n", int(rand(6))'` CRON_MINS=`/usr/bin/perl -e 'printf "%02d\n", int(rand(60));'`
convert input.png -pointsize 32 -gravity center -annotate 45 "hello, world" output.png
find $(locate hello) -type f -executable -print|grep -E "hello\$"
2012-08-18 07:51:53
Functions: find grep locate

This command allow you quick find any executable by keyword(s) in your system.

NOTE: Sometime this command will output like this:

`hello.py.launch': No such file or directory

this is normal behaviour

find -type f -printf '%P\000' | egrep -iz '\.(avi|mpg|mov|flv|wmv|asf|mpeg|m4v|divx|mp4|mkv)$' | sort -z | xargs -0 ls -1
/sbin/ifconfig | grep inet | cut -f 2 -d ":" | cut -f 1 -d " " |egrep -v "^$"
for i in `seq 254`;do ping -c 1 192.168.10.$i > /dev/null && echo "$i is up"||echo "$i is down";done
cls && ipconfig | findstr -R "[ IPv4 | adapter ]"
mdfind "tag:data" > /tmp/data.txt ; zip -r9@ ~/Desktop/data.zip < /tmp/data.txt
2009-02-24 14:49:50
User: vranx
Tags: Os X

finding all files with the metadata tag "data" using the metadata find command mdfind , writing the list to a temporary file, reading the input for the .zip file from this temporary file.

echo $X | egrep "^[0-9]+$"
find . -iname \*.[ch] -exec indent "{}" \;
2010-09-10 13:25:10
User: putnamhill
Functions: find

This version uses the indent C formatting utility. Doesn't appear to be included with ubuntu. But CentOS and MacOS have it.