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commandlinefu.com is the place to record those command-line gems that you return to again and again.

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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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Terminal - All commands - 12,422 results
yes '' | cat -n
. ~/.profile
2009-04-22 16:56:12
User: ruchi

If you edit your .profile you need to refresh it for changes to take place. Simple way to refresh is logout and login. This command is the quickest way to do it.

If you're deleting some variables, they would not get nulled with this command but just removed.

ps -L -p <pid> | wc -l
screen -ls | grep pts | gawk '{ split($1, x, "."); print x[1] }' | while read i; do gnome-terminal -e screen\ -dx\ $i; done
2009-04-22 10:36:39
User: microft
Functions: gawk grep read screen

connects to all the screen instances running.

sudo cat /dev/mem > /dev/dsp
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 :)

boxes -d dog or cowsay -f tux $M
2009-04-22 06:01:20
User: eastwind

Require boxes and / or cowsay packages.

After input boxes -d dog , type your text and then press ctrl + d . Same goes for cowsay .

toilet -f big ReadMe
2009-04-22 05:48:13
User: eastwind

need toilet package , same goes for figlet

showfigfonts | less : give the list of font available for options

2009-04-22 05:41:40
User: eastwind

sudo apt-get install moon-buggy

An ascii 2D game where you control a mooncar and try to avoid moonhole by jumping (press space )

2009-04-22 05:33:25
User: eastwind

sudo apt-get install bb

A demoscene intro in ascii art with tracker song

ldapsearch -v -H ldap://<server> -x -D cn=<johndoe>,cn=<users>,dc=<ourdomain>,dc=<tld> -w<secret> -b ou=<lazystaff>,dc=<ourdomain>,dc=<tld> -s sub sAMAccountName=* '*' | perl -pne 's/(\d{11})\d{7}/"DATE-AD(".scalar(localtime($1-11644473600)).")"/e'
2009-04-22 00:57:34
User: flux
Functions: perl

When Ldapsearch queries an Active directory server, all the dates are shown using a timestamp of 18 digits. This perl regexp decodes them in a more human friendly notation. 11644473600 corresponds to some microsoft epoch.

cal 09 1752
2009-04-22 00:13:19
User: flux
Functions: cal
Tags: date fun

The British Government entering in the Gregorian era.

ls /home | head -64 | barcode -t 4x16 | lpr
2009-04-21 22:54:45
User: flux
Functions: head ls
Tags: printing

64 elements max on 16 rows, 4 cols.

GNU Barcode will adapt automagically the width and the eight of your elements to fill the page.

Standard output format is PostScript.

( cat badfile.log ; tac badfile.log | tac ) > goodfile.log
2009-04-21 22:06:05
User: flux
Functions: cat tac

man tac

When there is a bad block in the middle of your file, you can see its begninning with `cat' and its end with `tac'. But both commands terminates with an error. So this sequence rebuilds a new file without badblock.

find . -maxdepth 1 -type f -name '*.sh' -o -name '*.txt'
apt-get moo
for i in sys dev proc; do sudo mount --bind /$i /mnt/xxx/$i; done
2009-04-20 16:52:14
User: amosshapira
Functions: mount sudo
Tags: bash mount chroot

The command is useful when, e.g., booting an existing system with a rescue or installation CD where you need to chroot into the hard-disk and be able to do stuff which accesses kernel info (e.g. when installing Ubuntu desktop with LVM2 you need to mount and chroot the hard disk from a shell window in order to install packages and run initramfs inside chroot).

The command assumes that /mnt/xxx is where the chroot'ed environment's root file system on the hard disk is mounted.

sudo dpkg-reconfigure tzdata
2009-04-20 02:08:23
User: hank
Functions: sudo
Tags: Ubuntu time

Reconfigures time zone in Ubuntu, which I cannot figure out how to do through the GUI. Worked like a charm to set my time zone to CEST from EDT.

wajig large
2009-04-19 20:26:26
User: udim
Tags: Debian wajig

Requires the "wajig" package to be installed.

dlocate [ package | string ]
2009-04-19 20:19:06
User: udim
Tags: Debian

This is the fastest method to search the Debian package database.

Requires the dlocate package. The dlocate db updates periodically, but you may force an update with

# dlocate-update

awk 'BEGIN {srand()} {print int(rand()*1000000) "\t" $0}' FILE | sort -n | cut -f 2-
2009-04-19 20:04:58
User: udim
Functions: awk cut sort

Replace FILE with a filename (or - for stdin).

find -type f -printf '%P\000' | egrep -iz '\.(avi|mpg|mov|flv|wmv|asf|mpeg|m4v|divx|mp4|mkv)$' | sort -z | xargs -0 ls -1
emerge -epv world | grep USE | cut -d '"' -f 2 | sed 's/ /\n/g' | sed '/[(,)]/d' | sed s/'*'//g | sort | uniq > use && grep ^- use | sed s/^-// | sed ':a;N;$!ba;s/\n/ /g' > notuse && sed -i /^-/d use && sed -i ':a;N;$!ba;s/\n/ /g' use
2009-04-19 07:54:08
User: Keruspe
Functions: cut grep sed sort uniq
Tags: Gentoo emerge USE

This command puts all the flags of the USE variable actually used by the packages you emerged to the file "use", and those which are unused but available to the file "notuse"

mount --bind /old/directory/path /new/directory/path
2009-04-19 01:44:59
User: dryicerx
Functions: mount

Like symlinked directories, you can mount a directory at a different location. For example mounting a directory from one location in to the http root without having to make your program follow symlinks or change permissions when reading.