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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.

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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 - 12,363 results
python -c "import SimpleHTTPServer;SimpleHTTPServer.test()"
2009-08-29 12:08:30
User: unixbhaskar
Functions: last
Tags: login shell

This command will reveal login has been made to the system as well as when the reboot occurs. It uses a file called /var/log/wtmp,which captures all the information about the successful login and reboot information. It has many switch ,by which you can get an idea when people login how long they stay.

mount |tail -1 | less -p "/dev/[^ ]*"
ln -s /destinationTarget /sourceTarget/newFolder
2009-03-12 01:56:34
User: topgun553
Functions: ln

if you wanted to create a new folder called "red" that was a symbolic link from /home/music/ to /home/hobbies/art then you would type:

ln -s /home/hobbies/art /home/music/red

gpg --refresh-keys
wb(){ for i in $(wget -O- -U "" "http://wallbase.cc/random/23/eqeq/1920x1080/0/" --quiet|grep wallpaper/|grep -oe 'http://wallbase.[^"]*'); do if (( n > "$1" )); then break;fi;let n++;wget $(wget -O- -U "" $i --quiet|grep -oe 'http://[^"]*\.jpg');done;}
aptitude search \~ilinux-image
gocr -i ~/Screenshot.png
2013-02-28 07:38:13
User: totti

Image to text converter.

Convert your scanned book in image format like .png, .jpg into editable text format.

OCR ==> Optical Code Reader

2009-05-19 19:07:11

From man tiger : Tiger is a package consisting of Bourne Shell scripts, C code and data files which is used for checking for security problems on a UNIX system. It scans system configuration files, file systems, and user configuration files for possible security problems and reports them.

mate - `find . -name 'filename'`
cat welcome | wall
2009-02-14 18:12:50
User: Williebee
Functions: cat

Show message in file "welcome" to all logged in terminal users.

2009-04-22 06:54:20
User: eastwind

tell you how many Non free software is on your machine, which package it is and which restriction on freedom it has . require vrms package , vrms mean virtual Richard M. Stallman :)

ls | perl -lne '++$x{lc $1} if /[.](.+)$/ }{ print for keys %x'
2010-08-13 20:05:15
User: recursiverse
Functions: ls perl

All with only one pipe. Should be much faster as well (sort is slow). Use find instead of ls for recursion or reliability.

Edit: case insensitive

awk '{if (NR % 2 == 0) print $0}' file.txt
echo '!'whammy
2009-03-26 23:34:33
User: sudopeople
Functions: echo
Tags: literal bang

Seems obvious, but other seemingly simple ways to use it don't work:

echo !whammy


echo "!whammy"

both output:

-bash: !whammy: event not found

and this:

echo "\!whammy"



with the slash :(

you can also do any combinations of quotes for a complex string:

echo "It's great to be able to use a bang ("'!'") in a command"'!'


It's great to be able to use a bang (!) in a command!
s=`head -$i fileName | tail -1`
mkdir ${1..10}
ls -ad .*
2009-02-18 15:22:39
User: osantana
Functions: ls

List only hidden files (or directories). You also can use:

ls -lad .*
rename .txt .md *.txt
ls | while read -r FILE; do mv -v "$FILE" `echo $FILE | tr -d ' '`; done
2010-08-14 14:10:48
User: IgnitionWeb
Functions: ls mv read tr
Tags: space echo while tr

all files in the directory get moved, in doing so the new name of the file is the original name with out spaces (using translate command)

while true ; do scripts/bootstrap.py ; ./manage.py runserver ; done
2009-03-27 04:43:54
User: taurus
Functions: true

I wrote a script called bootstrap.py to delete the database, then load a new database with initial values. With this single-line shell loop, when I need to make a schema change (which happens often in the early stages of some projects), I hit ctrl-C to stop the running Django server, then watch bootstrap.py do its thing, then watch the server restart.

0,30 * * * * php -q /address/to/script.php
2010-01-11 10:44:13
User: dotanmazor

Just put this line in a file that resides in your /etc/cron.d/ folder, and you're set.

The -q option is used to suppress php headers.

ls -lS
count=`wc -l file | cut -d ' ' -f1`
rec -c 2 -r 44100 -s -t wav - | flac - --sign=signed --channels=2 --endian=big --sample-rate=44100 --bps=16 -f -o file.flac
2011-08-30 03:14:32
User: bohwaz

You'll need to install sox and flac packages in Debian/Ubuntu.