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.


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.

Universal configuration monitoring and system of record for IT.
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

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!
Hide

Top Tags

Hide

Functions

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

Commands tagged Ubuntu from sorted by
Terminal - Commands tagged Ubuntu - 81 results
sudo chattr -i <file that cannot be modified>
2010-03-25 03:14:34
User: leovailati
Functions: chattr sudo
Tags: Ubuntu chattr
1

I had problems in Ubuntu while trying to edit /etc/resolv.conf, even with sudo I couldn't make any change. After a 2 minutes search on google I found this command.

Hope someone finds it useful.

It works like chmod, with + and - to denote which attributes are being added and which are being removed.

See other attributes on man pages or on wikipedia http://en.wikipedia.org/wiki/Chattr

sudo apt-get -o Acquire::http::Dl-Limit=30 upgrade
2010-03-22 01:29:44
User: alemani
Functions: sudo
16

Limits the usage of bandwidth by apt-get, in the example the command will use 30Kb/s ;)

It should work for most apt-get actions (install, update, upgrade, dist-upgrade, etc.)

flac -cd input.flac |lame -h - output.mp3
2010-03-05 23:54:21
User: nickleus
2

if you haven't already done so, install lame and flac:

sudo apt-get install lame flac

echo "pretty realistic virtual typing" | randtype -m 4
2010-02-25 15:30:28
User: tehdog
Functions: echo
4

this also generates errors (change 4 to higher number for more mistakes)

sudo aptitude update; sudo apt-get -y --print-uris upgrade | egrep -o -e "http://[^\']+" | sudo aria2c -c -d /var/cache/apt/archives -i -; sudo aptitude -y safe-upgrade
2010-02-18 16:02:29
User: freethinker
Functions: egrep sudo
2

Please install aria2c before you try the above command. On ubuntu the command to install aria2c would be:

sudo aptitude install aria2
ffmpeg -i /var/lib/mythtv/pretty/Chuck20100208800PMChuckVersustheMask.mpg -s 800x480 -vcodec mpeg4 -acodec libfaac -ac 2 -ar 16000 -r 13 -ab 32000 -aspect 16:9 Chuck20100208800PMChuckVersustheMask.mp4
2010-02-12 12:11:02
User: PLA
2

This command will transcode a MythTV recording. The target device is a Google Nexus One mobile phone. My recordings are from a HDHomerun with Over The Air content. Plays back nicely on the N1.

sudo sed -iorig '/\(up\|down\)/s/^/#/' /etc/zsh/zshrc
2010-02-02 23:17:08
User: cbrinker
Functions: sed sudo
Tags: Ubuntu vi zsh
1

Use sed to comment out any up/down bindings in zsh

rdesktop -a 16 luigi:3052
VBoxManage controlvm ServidorProducao savestate
nohup VBoxHeadless -p 3052 -startvm ServidorProducao &
sudo echo 0 > /sys/block/sdb/queue/rotational
2009-11-27 12:16:17
User: nickleus
Functions: echo sudo
5

if you still get a permissions error using sudo, then nano the file:

sudo nano -w /sys/block/sdb/queue/rotational

and change 1 to 0

this thread:

http://www.ocztechnologyforum.com/forum/showpost.php?p=369836&postcount=15

says that this will "help the block layer to optimize a few decisions"

flac --best *.wav
2009-11-11 14:17:24
User: nickleus
Tags: bash Ubuntu
3

cd to the folder containing the wav files, then convert them all to flac. yeah baby!

in ubuntu, to get the flac program just:

sudo apt-get install flac

flac file input formats are wav, aiff, raw, flac, oga and ogg

rename -v 's/.*[s,S](\d{2}).*[e,E](\d{2}).*\.avi/SHOWNAME\ S$1E$2.avi/' poorly.named.file.s01e01.avi
2009-09-29 16:39:57
User: Karakh
Functions: rename
18

Replace 'SHOWNAME' with the name of the TV show.

Add -n to test the command without renaming files.

Check the 'sample output'.

echo "blacklist pcspkr"|sudo tee -a /etc/modprobe.d/blacklist.conf
2009-09-27 11:42:47
User: sliceoflinux
Functions: echo sudo tee
4

This command will disable the beep sound from the PC speaker.

update-java-alternatives
2009-08-09 02:43:06
User: stuart
Tags: Debian Ubuntu
2

Lets you set all the java alternatives at once to a matching version. Also has options for just changing the jre or the plugin.

ran=$(head /dev/urandom | md5sum); MAC=00:07:${ran:0:2}:${ran:3:2}:${ran:5:2}:${ran:7:2}; sudo ifconfig wlan0 down hw ether $MAC; sudo ifconfig wlan0 up; echo ifconfig wlan0:0
2009-07-16 16:21:44
User: workingsmart
Functions: echo head ifconfig sudo
7

Next time you are leaching off of someone else's wifi use this command before you start your bittorrent ...for legitimate files only of course.

It creates a hexidecimal string using md5sum from the first few lines of /dev/urandom and splices it into the proper MAC address format. Then it changes your MAC and resets your wireless (wlan0:0).

notify-send ["<title>"] "<body>"
2009-04-29 10:05:20
User: cammarin
47

The title is optional.

Options:

-t: expire time in milliseconds.

-u: urgency (low, normal, critical).

-i: icon path.

On Debian-based systems you may need to install the 'libnotify-bin' package.

Useful to advise when a wget download or a simulation ends. Example:

wget URL ; notify-send "Done"
lspci |grep VGA
2009-04-28 08:34:42
User: CafeNinja
Functions: grep lspci
Tags: video Ubuntu
1

Displays only the VGA adapter/chipset being used for the graphics. In this case, it gave me the "M22" and "Mobility Radeon x300" that I needed to research a graphics issue I was having.

lsof -i
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.

dpkg -S /usr/bin/ls
2009-04-18 18:18:23
User: bwoodacre
44

'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'.

sudo killall -9 pulseaudio; pulseaudio >/dev/null 2>&1 &
2009-04-11 20:18:35
User: hank
Functions: killall sudo
14

Ever since the switch to pulseaudio, Ubuntu users including myself have found themselves with no sound intermittently. To fix this, just use this command and restarts firefox or mplayer or whatever.

dpkg --get-selections > LIST_FILE
2009-03-28 17:45:29
User: cammarin
11

This command is useful when you want to install the same packages on another fresh OS install for example. To do that, use:

sudo dpkg --set-selections < LIST_FILE
do-release-upgrade
2009-03-25 07:25:33
User: dizzgo
Tags: Ubuntu
-1

release upgrades are major upgrades as from 8.04 to 8.10 or from 8.10 to 9.04

update-manager-core must be installed:

sudo apt-get install update-manager-core

in some cases you must edit '/etc/update-manager/release-upgrades' and set 'Prompt=normal'

mv file_name.extension ..
2009-03-09 15:35:58
User: takealeft
Functions: mv
-3

cd into the directory that contains the file.

this is just the usual move command but shortcut'd.

say you wanted to move a photo img1.png from ~/photos/holidayphotos into the parent directory which is ~/photos

command would be:

~/photos/holidayphotos$ mv img1.png ..

I use Ubuntu so this'll work in debian but not sure what else.