Hide

What's this?

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.


If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Hide

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

Hide

News

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.
Hide

Tags

Hide

Functions

All commands from sorted by
Terminal - All commands - 11,848 results
bb
2009-04-22 05:33:25
User: eastwind
0

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
4

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
9

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
8

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
15

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
3

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
3

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
14

Requires the "wajig" package to be installed.

dlocate [ package | string ]
2009-04-19 20:19:06
User: udim
Tags: Debian
4

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
-3

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)$' | sort -z | xargs -0 ls -1
sl
emerge -epv world | grep USE | cut -d '"' -f 2 | sed 's/ /\n/g' | sed '/[(,)]/d' | sed s/'*'//g | sort | uniq > use && grep ^- use | sed s/^-// | sed ':a;N;$!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
1

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
4

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.

script /dev/null | tee /dev/pts/3
2009-04-19 00:29:45
Functions: script tee
10

can display the commands and their output to another user who is connected to another terminal, by example pts/3

dpkg -S /usr/bin/ls
2009-04-18 18:18:23
User: bwoodacre
39

'dpkg -S' just matches the string you supply it, so just using 'ls' as an argument matches any file from any package that has 'ls' anywhere in the filename. So usually it's a good idea to use an absolute path. You can see in the second example that 12 thousand files that are known to dpkg match the bare string 'ls'.

dd if=yourimage.img of=/dev/sdb1
2009-04-17 23:55:13
User: rissajeanne
Functions: dd
-9

where /dev/sdb1 is the name of your usb device

cdrecord dev=0,0,0 -v -eject yourimage.iso
2009-04-17 23:44:22
User: rissajeanne
Functions: cdrecord
2

cdrecord -scanbus will tell you the (x,y,z) value of your cdr (for example, mine is 3,0,0)

echo *
2009-04-17 21:40:58
User: kFiddle
Functions: echo
Tags: echo ls
-5

Sometimes "ls" is just too slow, especially if you're having problems with terminal scroll speed, or if you're a speed freak. In these situations, do an echo * in the current directory to immediately see the directory listing. Do an echo * | tr ' ' '\n' if you want a column. Do an alias ls='echo *' if you want to achieve higher echelons of speed and wonder. Note that echo * is also useful on systems that are so low in memory that "ls" itself is failing - perhaps due to a memory leak that you're trying to debug.

hostname -i
2009-04-17 21:26:56
User: kFiddle
Functions: hostname
Tags: IP hostname
-2

I've seen some versions of hostname that don't have the -i option, so this may not work everywhere. When available, it's a better alternative than using ifconfig and wasting eyeball muscle to search for the address, and it's definitely simpler than using awk/sed.

ssh user@server | tee logfilename
2009-04-17 19:17:02
User: bassu
Functions: ssh tee
6

Optionally, you can create a new function to do this with a custom command. Edit $HOME/.bashrc and add:

myssh () { ssh $1 | tee sshlog ; }

Save it.

At command prompt:

myssh user@server
cat [ENTER]^V^O[ENTER]^D
2009-04-17 13:16:56
User: minliu2k
Functions: cat
-3

^V means CTRL-V

[ENTER] means ENTER key

lsof -c dhcpd
2009-04-17 07:18:38
User: d4n3sh
25

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