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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 - 11,618 results
sed 's/$'"/`echo \\\r`/"
gpg --encrypt --recipient 'Foo Bar' foo.txt
2009-02-16 19:58:13
User: mariusz
Functions: gpg

gpg command to encrypt a file on the command line.

gpg --output foo.txt --decrypt foo.txt.pgp
2009-02-16 19:56:19
User: mariusz
Functions: gpg

gpg command to decrypt a previously encrypted file on the command line.

Can be optionally made into an alias:

alias decrypt='gpg --output foo.txt --decrypt foo.txt.pgp'

find path/to/folder/ -type f -print0 | xargs -0 -n 1 md5sum | awk '{print $1}' | sort | md5sum | awk '{print $1}'
2009-02-16 19:39:37
User: mcover
Functions: awk find md5sum sort xargs

For quick validation of folder's file-contents (structure not taken into account) - I use it mostly to check if two folders' contents are the same.

netstat -putona
2009-02-16 19:14:35
User: starchox
Functions: netstat

-p PID and name of the program

-u on a UDP port.

-t also TCP ports

-o networking timer

-n numeric IP addresses (don't resolve them)

-a all sockets

echo "<?php phpinfo(); ?>" | php > phpinfo.txt
echo "SELECT * FROM table; " | mysql -u root -p${MYSQLROOTPW} databasename | sed 's/\t/","/g;s/^/"/;s/$/"/;s/\n//g' > outfile.csv
2009-02-16 18:55:18
Functions: echo sed

This command converts a MySQL query directly into a .csv (Comma Seperated Value)-file.

smbcacls //server/sharename file -U username
2009-02-16 18:52:14
User: drossman
Functions: file

You can read, add, delete and modify Windows permissions from Linux using smbcacls from the smb-client package.

df / | awk '{print $1}' | grep dev | xargs tune2fs -l | grep create
2009-02-16 18:45:03
User: Kaio
Functions: awk df grep tune2fs xargs

Very useful set of commands to know when your file system was created.

for i in `df -P |grep string|cut -f2 -d%|cut -c2-100`; do umount -l -f $i;done
2009-02-16 18:42:00
User: Kaio
Functions: umount

Sometimes, you have a lot of NFS in the server and you can't or shouldn't use umount -a. Whis this command, you only umount the fs related to the 'string'

echo "sed -e"|perl -pe 's/sed -e/perl -pe/'
2009-02-16 18:39:06
User: drossman
Functions: echo

Replace sed regular expressions with perl patterns on the command line.

The sed equivalent is: echo "sed -e"|sed -e 's/sed -e/perl -pe/'

dd if=/dev/zero of=/swapfile bs=1M count=64; chmod 600 /swapfile; mkswap /swapfile; swapon /swapfile
2009-02-16 18:36:38
User: starchox
Functions: chmod dd mkswap swapon

In addition to a swap partition, Linux can also use a swap file. Some programs, like g++, can use huge amounts of virtual memory, requiring the temporary creation of extra space.

find . -type f -perm +0111 -print
scp user@hostb:file user@hostc:
2009-02-16 18:33:08
User: drossman
Functions: scp

While at the command line of of hosta, scp a file from remote hostb to remote hostc. This saves the step of logging into hostb and then issuing the scp command to hostc.

function man2pdf(){ man -t ${1:?Specify man as arg} | open -f -a preview; }
2009-02-16 18:29:35
User: piXelz
Functions: as man

Simply pass an argument to the script to convert the manual page to a PDF:

man2pdf drutil
/System/Library/CoreServices/Menu\ Extras/User.menu/Contents/Resources/CGSession -suspend
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
apache2 -t -D DUMP_MODULES
2009-02-16 17:30:20
User: ElAlecs
Tags: apache httpd

This let you know which modules has loaded the Apache server, very useful to know if the mod_rewrite is ready to use.

_cd ~/nsfw; mplayer midget_donkey.mpeg
2009-02-16 17:19:40
User: Kirbe

Note the extra space before the command (I had to put it as an underscore since the website eats up preceding spaces). That's all it takes. Now if you check your history with "$ history", it wont show up.

find . -name "*.jar" | xargs -tn1 jar tvf | grep --color "SearchTerm"
2009-02-16 17:18:36
Functions: find grep xargs

Great for finding which jar some pesky class is hiding in!

find . -name "*.pyc" -exec rm {} \;
2009-02-16 17:15:58
User: nsmgr8
Functions: find rm

For a python project, sometimes I need to clean all the compiled python files. I have an alias 'rmpyc' to this command. This really saves me a lot of typing and hunting throughout the folders to delete those files.

for I in `find . -name "*.php"`; do sed -i "s/old name/new name/g" $I; done
2009-02-16 17:09:09
User: ruedu
Functions: sed

So you have a web site and you've plastered your significant other's name all over it. But you broke up with them and have some new love in your life. How do you find all those instances of their name and replace them?

pushd /tmp
2009-02-16 16:52:59
User: ruedu

If are a Bash user and you are in a directory and need to go else where for a while but don't want to lose where you were, use pushd instead of cd.

cd /home/complicated/path/.I/dont/want/to/forget

pushd /tmp

cd thing/in/tmp

popd (returns you to /home/complicated/path/.I/dont/want/to/forget)

for I in `echo "show databases;" | mysql | grep -v Database`; do mysqldump $I > "$I.sql"; done
2009-02-16 16:41:05
User: ruedu
Functions: grep

Backups all MySQL databases to individual files. Can be put into a script that grabs current date so you have per day backups.

ip route | grep default | awk '{print $3}'
2009-02-16 16:29:03
User: ruedu
Functions: awk grep route

This gets you your default route programatically, useful for scripts