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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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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
DISPLAY=:0.0 import -window root /tmp/shot.png
2010-10-28 12:00:00
User: depesz

Of course it requires import command, from imagemagick tools, but it's simpler to type, and imagemagick is usefull anyway.

vi +/pattern [file]
2010-04-24 22:15:12
User: punkwalrus
Functions: vi
Tags: vim edit vi

Open up vi or vim at the first instance of a pattern in [file]. Useful if you know where you want to be, like "PermitRootLogin" in sshd_config. Also, vi +10 [file] will open up a file at line 10. VERY useful when you get "error at line 10" type of output.

PROMPT_COMMAND='if [ $RANDOM -le 3200 ]; then printf "\0337\033[%d;%dH\033[4%dm \033[m\0338" $((RANDOM%LINES+1)) $((RANDOM%COLUMNS+1)) $((RANDOM%8)); fi'
2010-04-01 06:52:32
User: hotdog003
Functions: printf
Tags: bash

Add this to a fiend's .bashrc.

PROMPT_COMMAND will run just before a prompt is drawn.

RANDOM will be between 0 and 32768; in this case, it'll run about 1/10th of the time.

\033 is the escape character. I'll call it \e for short.

\e7 -- save cursor position.

\e[%d;%dH -- move cursor to absolute position

\e[4%dm \e[m -- draw a random color at that point

\e8 -- restore position.

tar -cf - . | pv -s $(du -sb . | awk '{print $1}') | gzip > out.tgz
2009-12-18 17:09:08
User: opertinicy
Functions: awk du gzip tar

What happens here is we tell tar to create "-c" an archive of all files in current dir "." (recursively) and output the data to stdout "-f -". Next we specify the size "-s" to pv of all files in current dir. The "du -sb . | awk ?{print $1}?" returns number of bytes in current dir, and it gets fed as "-s" parameter to pv. Next we gzip the whole content and output the result to out.tgz file. This way "pv" knows how much data is still left to be processed and shows us that it will take yet another 4 mins 49 secs to finish.

Credit: Peteris Krumins http://www.catonmat.net/blog/unix-utilities-pipe-viewer/

some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)
2009-12-01 03:58:04
User: tylerl

You can use [n]> combined with >(cmd) to attach the various output file descriptors to be the input of different commands.

( ( sleep 2h; your-command your-args ) & )
2009-08-19 17:39:11
User: sitaram
Functions: sleep

doesn't require "at", change the "2h" to whatever you want... (deafult unit for sleep is seconds)

cd !$:h
2009-08-07 00:37:08
User: lingo
Functions: cd

Uses the last argument of the last executed command, and gets the directory name from it.

Use $!:t for the filename alone, without the dirname.

perl -e 'print "P1\n256 256\n", map {$_&($_>>8)?1:0} (0..0xffff)' | display
2009-07-08 17:50:23
User: dstahlke
Functions: perl

OK, not the most useful but a good way to impress friends. Requires the "display" command from ImageMagick.

lsof -c dhcpd
2009-04-17 07:18:38
User: d4n3sh

List all file opened by a particular command based on it's command name.

curl -Is slashdot.org | egrep '^X-(F|B|L)' | cut -d \- -f 2
$ grep -rl oldstring . |xargs sed -i -e 's/oldstring/newstring/'
2009-03-03 20:10:19
User: netfortius
Functions: grep sed
Tags: perl sed

recursively traverse the directory structure from . down, look for string "oldstring" in all files, and replace it with "newstring", wherever found


grep -rl oldstring . |xargs perl -pi~ -e 's/oldstring/newstring'
xset dpms force standby
netstat -ant | awk '{print $NF}' | grep -v '[a-z]' | sort | uniq -c
tar --create --file - --posix --gzip -- <dir> | openssl enc -e -aes256 -out <file>
2012-11-27 15:33:45
User: seb1245
Functions: tar

Create an AES256 encrypted and compressed tar archive.

User is prompted to enter the password.

Decrypt with:

openssl enc -d -aes256 -in <file> | tar --extract --file - --gzip
read -s pass; echo $pass | md5sum | base64 | cut -c -16
2011-11-24 20:23:47
User: bugmenot
Functions: cut echo md5sum read

Why remember? Generate!

Up to 48 chars, works on any unix-like system (NB: BSD use md5 instead of md5sum)

bc <<< 'obase=60;299'
2011-10-21 13:15:17
User: mathias
Functions: bc

This is a very simple way to input a large number of seconds and get a more useful value in minutes and seconds. Avoids useless use of echo.

( command & )
2011-01-07 19:06:30
User: wiburg
Functions: command

Test scenario:

* Open xterm (or konsole, ...)

* Start xeyes with: ( xeyes & )

* Close the xterminal

The xeyes process should be still running.

file -s /dev/sd*
2010-12-28 09:56:03
User: mhs
Functions: file
Tags: file devfs

file(1) can print details about certain devices in the /dev/ directory (block devices in this example). This helped me to know at a glance the location and revision of my bootloader, UUIDs, filesystem status, which partitions were primaries / logicals, etc.. without running several commands.

See also:

file -s /dev/dm-* file -s /dev/cciss/*


rm *.txt <TAB> <TAB>
2010-11-04 13:58:15
User: boschi
Functions: rm

alternative for "echo rm *.txt". Just doubletab the command you are willing to use and it will show you the affected files.

grep -Fx -f file1 file2
<ESC> .
xkcd(){ wget -qO- http://xkcd.com/|tee >(feh $(grep -Po '(?<=")http://imgs[^/]+/comics/[^"]+\.\w{3}'))|grep -Po '(?<=(\w{3})" title=").*(?=" alt)';}
2009-11-27 09:11:47
User: eightmillion
Functions: grep tee wget

This function displays the latest comic from xkcd.com. One of the best things about xkcd is the title text when you hover over the comic, so this function also displays that after you close the comic.

To get a random xkcd comic, I also use the following:

xkcdrandom(){ wget -qO- dynamic.xkcd.com/comic/random|tee >(feh $(grep -Po '(?<=")http://imgs[^/]+/comics/[^"]+\.\w{3}'))|grep -Po '(?<=(\w{3})" title=").*(?=" alt)';}
read -sn 1 -p "Press any key to continue..."
clfavs(){ URL="http://www.commandlinefu.com";wget -O - --save-cookies c --post-data "username=$1&password=$2&submit=Let+me+in" $URL/users/signin;for i in `seq 0 25 $3`;do wget -O - --load-cookies c $URL/commands/favourites/plaintext/$i >>$4;done;rm -f c;}
2009-09-30 16:43:08
User: suhasgupta
Functions: c++ wget

Usage: clfavs username password num_favourite_commands file_in_which_to_backup

tar -cj /backup | cstream -t 777k | ssh host 'tar -xj -C /backup'
2009-07-02 10:05:53
User: wires
Functions: host ssh tar

this bzips a folder and transfers it over the network to "host" at 777k bit/s.

cstream can do a lot more, have a look http://www.cons.org/cracauer/cstream.html#usage

for example:

echo w00t, i'm 733+ | cstream -b1 -t2

hehe :)