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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!

Top Tags



Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

All commands from sorted by
Terminal - All commands - 12,394 results
dvd+rw-format -force /dev/dvd1
export LANG=C; grep string longBigFile.log
2009-07-14 12:48:02
User: ioggstream
Functions: export grep
Tags: grep LANG

greps using only ascii, skipping the overhead of matching UTF chars.

Some stats:

$ export LANG=C; time grep -c Quit /var/log/mysqld.log


real 0m0.191s

user 0m0.112s

sys 0m0.079s

$ export LANG=en_US.UTF-8; time grep -c Quit /var/log/mysqld.log


real 0m13.462s

user 0m9.485s

sys 0m3.977s

Try strace-ing grep with and without LANG=C

git ls-files -z --deleted | xargs -0 git rm
2009-07-14 08:29:38
User: blindgaenger
Functions: xargs
Tags: git

I've used technicalpickles command a lot, but this one handles whitespaces in filenames. I'm sure you want to create an alias for it :)

find . -type f ! -name "*html"
find . -name '*.html' -print0| xargs -0 -L1 cat |sed "s/[\"\<\>' \t\(\);]/\n/g" |grep "http://" |sort -u
2009-07-14 07:00:15
User: jamespitt
Functions: cat find grep sed sort xargs

Just a handy way to get all the unique links from inside all the html files inside a directory. Can be handy on scripts etc.

tar cvfz changes.tar.gz --exclude-vcs `svn diff -rM:N --summarize . | grep . | awk '{print $2}' | grep -E -v '^\.$'`
2009-07-13 19:39:10
User: jaysee
Functions: awk diff grep tar

Handy when you need to create a list of files to be updated when subversion is not available on the remote host. You can take this tar file, and upload and extract it where you need it. Replace M and N with the revisions specific to yours. Make sure you do this from an updated (svn up) working directory.

grep <pattern> -R . --exclude-dir='.svn'
fmiss() { grep -RL "$*" * }
2009-07-13 18:30:54
User: inkel
Functions: grep
Tags: grep

This one would be much faster, as it's only one executed command.

cat /dev/urandom|awk 'BEGIN{"tput cuu1" | getline CursorUp; "tput clear" | getline Clear; printf Clear}{num+=1;printf CursorUp; print num}'
2009-07-13 07:30:51
User: axelabs
Functions: awk cat printf
Tags: nawk awk clear tput

awk can clear the screen while displaying output. This is a handy way of seeing how many lines a tail -f has hit or see how many files find has found. On solaris, you may have to use 'nawk' and your machine needs 'tput'

cd /example/directory && unzip \*.zip
2009-07-12 21:45:13
User: Paaskehare
Functions: cd

Simple but useful little command to unzip all files in a directory.

infile=$1 for i in $(cat $infile) do echo $i | tr "," "\n" | sort -n | tr "\n" "," | sed "s/,$//" echo done
2009-07-12 21:23:37
User: iframe
Functions: cat echo sed sort tr
Tags: cat bash sort sed tr

Save the script as: sort_file

Usage: sort_file < sort_me.csv > out_file.csv

This script was originally posted by Admiral Beotch in LinuxQuestions.org on the Linux-Software forum.

I modified this script to make it more portable.

urxvtd -q -o -f
2009-07-12 14:09:06

- for .xsession use -

Advantages of running a urxvt daemon include faster creation time for terminal windows and a lot of saved memory.

You can start new terminals as childs of urxvtd by typing urxvtc. Another advantage is, that background jobs are always owned by the urxvtd and will survive as long the daemon is running.

lsof |awk ' {if ( $0 ~ /home/) print substr($0, index($0,"/home") ) }'|cut -d / -f 1-4|sort|uniq -c|sort -bgr
perl -e '$p=qr!(?:0|1\d{0,2}|2(?:[0-4]\d?|5[0-5]?|[6-9])?|[3-9]\d?)!;print((shift=~m/^$p\.$p\.$p\.$p$/)?1:0);'
2009-07-12 00:24:29
User: speaker
Functions: perl

This command will output 1 if the given argument is a valid ip address and 0 if it is not.

iconv -f437 -tutf8 asciiart.nfo
2009-07-11 23:50:05
User: speaker
Functions: iconv

Files containing ascii art (e.g. with .nfo extension) are typically not correctly reproduced at the command line when using cat. With iconv one can easily write a wrapper to solve this:


if [ -z "$@" ]; then echo "Usage: $(basename $0) file [file] ..."

else iconv -f437 -tutf8 "$@"; fi

exit 0
while true; do beep -l66 -f`head -c2 /dev/input/mice|hexdump -d|awk 'NR==1{print $2%10000}'`; done
2009-07-11 12:01:27
User: 5z474n
Functions: awk hexdump

Beeps on mouse's every move. Bear in mind that, at least on Ubuntu, /dev/input/mice can be read only by root.

xdg-open http://gmail.com
2009-07-11 11:48:32
User: PLA

I rarely use the system menu to start applications. I use keyboard shortcuts instead. Keyboard shortcuts are convenient time savers. To configure the shortcuts I use gconf-editor or CompizConfig Settings Manager (if I have Compiz turned on). Lately I've been using Chromium as my browser. Since Chromium is under heavy development it occasionally becomes unusable and I have to switch back to Firefox. I was hard-coding the browser command in my keyboard shortcuts. This became problematic with frequent browser hopping. I now use the xdg-open command when defining my keyboard shortcuts. xdg-open opens a file or URL in the user's preferred application. In the metacity keybinging_commands I have xdg-open http://gmail.com where I used to have firefox http://gmail.com. Now when switching browsers I don't have to update each keyboard binding command I just change my default browser in Ubuntu by clicking through the menu: System / Preferences / Preferred Applications / Web Browser. xdg-open is more convenient for this browser hopper.

tokill=`ps -fea|grep process|awk '{ printf $2" "}'`; kill -9 $tokill;
tempo=33; slope=10; maxfreq=888; function sinus { echo "s($1/$slope)*$maxfreq"|bc -l|tr -d '-'; }; for((i=1;;i++)); do beep -l$tempo -f`sinus $i`; done
2009-07-10 21:24:11
User: 5z474n
Functions: bc echo tr

Infinitely plays beeps with sinusoidally changing sound frequency. Ideal for alarm on an event.

tar -C <source> -cf - . | tar -C <destination> -xf -
cat /dev/clipboard; $(somecommand) > /dev/clipboard
2009-07-10 18:48:21
User: sud0er
Functions: cat
Tags: windows cygwin

I spent a bunch of time yesterday looking for the xsel package in Cygwin- turns out you can use the /dev/clipboard device to do the same thing.

cat <<.>> somefilename
2009-07-10 17:45:42
User: tomlouie
Functions: cat
Tags: text

If you just want to write or append some text to a file without having to run a text editor, run this command. After running the command, start typing away. To exit, type . on a line by itself.

Replacing the >> with a single > will let you overwrite your file.

for i in `seq 1 3`; do scp [email protected]$i:file.txt server$i-file.txt; done
ssh [email protected] 'tail --max-unchanged-stats=10 -n0 -F /var/log/auth.log ' | grep Accepted | while read l ; do kdialog --title "SSH monitor" --passivepopup "$l" 3; done
for y in $(seq 2009 2011); do cal $y; done
2009-07-10 10:07:46
Functions: cal seq
Tags: bash seq cal

print multiple increasing years using cal - calendar -. You can also try

seq Start Increment End