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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.




All commands from sorted by
Terminal - All commands - 11,951 results
crontab -e
lynx -useragent=Opera -dump 'http://www.facebook.com/ajax/typeahead_friends.php?u=4&__a=1' |gawk -F'\"t\":\"' -v RS='\",' 'RT{print $NF}' |grep -v '\"n\":\"' |cut -d, -f2
_ff(){ cd /mnt;echo /mnt/*/* |sed 's/ \/mnt\//\&/g' |sed '/'"$1"'/!d'; cd -;}
2011-12-30 23:25:31
User: argv
Functions: cd echo sed


cd /mnt;

echo /mnt/*/* |sed '

s/ \/mnt\//\&/g;

'|sed '/'"$1"'/!d';

cd -;



case $# in


echo "usage: ff glob [sed-cmds] [--|var-name]"



_ff $1 |sed =



case $2 in

--) _ff $1 |less -SN


*) _ff $1 |sed -n ''"$2"''|tr '\n' '\040' |sed 's/.*/export '"$3"'=\"&/;s/=\" /=\"/;s/ $/\"/' > $HOME/.ff;

case $# in


. $HOME/.ff



sed '

s/export .*=\"/\$'"$3"' = \"/;' $HOME/.ff;\







local a=$HOME;

sed '

s/export /less -n \$/;


' $a/.ff > $a/.v ;

. $a/.v ;


Another approach using ls(1)


_lsl ()


ls -l $3 /mnt/*/$1* 2>/dev/null;


case $# in


echo "usage: lsl pat [ls-options|result-no]";

echo "usage: lsle pat [sed-cmds]"



_lsl $1 |sed =



case $2 in

-*) _lsl $1 $@;;


_lsl $1 |sed 's/.* //;


'"$2"'q' > $HOME/.lsl ;

export v=$(sed 1q $HOME/.lsl);

echo \$v = $v







echo "%s/\$/ /";

echo "%j";

echo "s/^/export v=\"";

echo "s/\$/\"";

echo "s/ \"\$/\"";

echo ".";

echo "wq";



lsl $1 -1 |sed $2 > .lsl&&

exp |ed -s .lsl >&-&&

. .lsl&&

echo \$v = $v;


export PATH=$PATH:/home/user/my_prog
2009-03-18 00:03:42
User: Zenexer
Functions: top

A simple but effective replacement for ps aux. I used to waste my time running ps over and over; top is the way to go. It also allows complex sorting options. Press q to exit "nicely" (Ctrl + C is always an option, of course). Note that the list updates each second, resorting in the process; if you're trying to grab a specific PID, you might be better off with ps.


Alternatively, htop is available, though it may not come pre-installed. htop is slightly more interactive than top and includes color coding, visuals, and a nice interface for selecting and then killing processes. (Thanks to bwoodacre for this great tool.)

kill -9 `pgrep $PROCESS_NAME`
2010-06-18 20:43:24
User: juanse006
Functions: kill

The pgrep retrieves the PID, then the KILL receive it, and kill it...

It works also if the application has more than one instance....

kill_daemon() { echo "Daemon?"; read dm; kill -15 $(netstat -atulpe | grep $dm | cut -d '/' -f1 | awk '{print $9}') }; alias kd='kill_daemon
2009-05-26 20:39:56
User: P17

Just find out the daemon with $ netstat -atulpe. Then type in his name and he gets the SIGTERM.

dpkg-query -W | grep perl
2010-07-20 16:14:04
Functions: grep

IMVHO if you are using cpan to install perl modules you are doing it wrong.

FOR /f %%g in ('echo %1 ^| iconv -f gbk -t utf-8') DO curl -x proxy:port -u user:pass -d status=%%g -d source="cURL" http://twitter.com/statuses/update.xml
2010-07-21 04:53:54
User: MeaCulpa
Functions: iconv

Aside from curl one will need iconv windows binary since windows lacks a native utf-8 cli interface. In my case I need a proxy in China and iconv to convert gbk status string into utf-8. GnuWin32 is a good choice with loads of coreutils natively ported to Windows

"FOR /f" is the solution to pass iconv output to curl.

Printing portion of a big file
2009-03-30 11:08:38
User: acirulli
Tags: sed

If you need to print some portion of a huge file, let's say you want to print from line 200 to 300, you can use this command to print the line from LINE1 to LINE2 of file FILE.

shred -v filename
dd if=/dev/urandom of=/dev/speaker bs=1
2010-10-27 09:22:40
User: khashmeshab
Functions: dd

Sends random beeps to your PC-speaker. Think... You can also run it remotely on another computer using SSH and scare its user! Don't forget to run it on your dedicated hosting server and watch sysadmin's action from data-center's live remote cameras!

awk 'END {print NR}' /etc/passwd
dd if=/dev/urandom of=/dev/dsp
2010-10-27 09:25:02
User: khashmeshab
Functions: dd

Sends random sounds to your sound card output (e.g. your speaker). Think... You can also run it remotely on another computer using SSH and scare its user!

echo 1+1|bc
x=; whois $x > $x.txt
2011-01-17 03:33:49
User: sxiii
Functions: whois

This can be used in scripts, to find out the origin of target IP etc.

echo -en "$USER@$HOSTNAME:${PWD##*/}> ";while read x;do echo $x>>/tmp/log.txt;echo $x|$0 2>&1;echo -en "$USER@$HOSTNAME:${PWD##*/}> ";done
export var1=`ps -A | grep '[u]nique' | cut -d '?' -f 1`; echo${var1/ /}; kill -9 $var1
2010-03-22 21:06:58
User: headyadmin
Functions: cut export grep kill
Tags: Os X

This will kill a specific process you don't know the PID of, when pidof and pgrep are not available, for example on OS X. var1 is created so that the whitespace can be trimmed before passing off to kill.

join file1.txt file2.txt > file3.txt
apt-get search something | grep specific
2010-09-27 07:10:39
User: ProfOak
Functions: apt grep

replace apt-get with your distro's package manager.

Where 'something' is the package name, and 'specific' is what you're specifically looking for.

This helps if your query is 2+ words long.

grep -A 3 -i "example" demo_text
python -c "import socket; print '\n'.join(socket.gethostbyname_ex(socket.gethostname())[2])"
2009-04-30 16:10:43
User: haivu
Functions: python
Tags: Network python

The socket.gethostname() call returns the host name of the computer. The socket.gethostbyname_ex() call returns a list of three items: The host name, the list of aliases for this host, and a list of IP addresses. Recall that Python?s array starts with index 0, the socket.gethostbyname_ex(?)[2] expression refers to the list of IP addresses. Finally, the print statement prints out the IP addresses, one per line.

curl whatismyip.org