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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!

Top Tags



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

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Terminal - All commands - 12,392 results
find . -type f -print0|xargs -0 md5sum|sort|perl -ne 'chomp;$ph=$h;($h,$f)=split(/\s+/,$_,2);print "$f"."\x00" if ($h eq $ph)'|xargs -0 rm -v --
2009-06-07 03:14:06
Functions: find perl rm xargs

This one-liner will the *delete* without any further confirmation all 100% duplicates but one based on their md5 hash in the current directory tree (i.e including files in its subdirectories).

Good for cleaning up collections of mp3 files or pictures of your dog|cat|kids|wife being present in gazillion incarnations on hd.

md5sum can be substituted with sha1sum without problems.

The actual filename is not taken into account-just the hash is used.

Whatever sort thinks is the first filename is kept.

It is assumed that the filename does not contain 0x00.

As per the good suggestion in the first comment, this one does a hard link instead:

find . -xdev -type f -print0 | xargs -0 md5sum | sort | perl -ne 'chomp; $ph=$h; ($h,$f)=split(/\s+/,$_,2); if ($h ne $ph) { $k = $f; } else { unlink($f); link($k, $f); }'
find -L /path/to/check -type l -delete
2009-06-06 16:07:04
Functions: find

If you don't want to delete them, but just want to list them, do

find -L /path -type l

If you want to delete them with confirmation first, do

find -L /path -type l -exec rm -i {} +

Using the -L flag follows symlinks, so the -type l test only returns true if the link can't be followed, or is a symlink to another broken symlink.

ls | curl -F 'sprunge=<-' http://sprunge.us | xclip
2009-06-06 11:35:14
User: tatwright
Functions: ls

The URL can then be pasted with a middle click.

This is probably useful when trying to explain problems over instant messaging when you don't have some sort of shared desktop.

ssh -f -N -L 5432:talk.google.com:5222 [email protected]
2009-06-05 23:17:21
User: dcabanis
Functions: ssh
Tags: ssh

If your firewall or proxy at your location prevents connection to a particular host or port, you can use ssh to tunnel to your home server and do it there instead.

ssf -f -N -L 4321:home.network.com:25 [email protected]
2009-06-05 23:12:02
User: dcabanis
Tags: ssh

Uses ssh as tunnel tunnel for an other connection.

-f runs ssh in the background -N tell that there is no command to run -L deals with the forwarding aspect where the first number is the local port number, the second is parameter is the name of the server to forward to and the third parameter is the port number on that server. The last part of the command is the usual ssh form consisting of the user name and remote server name

ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/outputFile.mpg
2009-06-05 21:11:17
User: dcabanis
Tags: video X11 ffmpeg

Grab X11 input and create an MPEG at 25 fps with the resolution 800x600

ssh $HOST -l$USER cat /REMOTE/FILE | sdiff /LOCAL/FILE -
rsync -e 'ssh -p PORT' [email protected]:SRC DEST
2009-06-05 16:52:43
Functions: rsync

tested on cygwin and Fedora 9 .

good to remember for those jobs where you cannot set a site-specific connect option in your ~/.ssh/config file.

svn log -v -r{2009-05-21}:HEAD | awk '/^r[0-9]+ / {user=$3} /yms_web/ {if (user=="george") {print $2}}' | sort | uniq
2009-06-05 14:07:28
User: jemptymethod
Functions: awk sort
Tags: svn awk log

just change the date following the -r flag, and/or the user name in the user== conditional statement, and substitute yms_web with the name of your module

find ./* -ctime -1 | xargs ls -ltr --color
2009-06-05 13:53:26
User: gnuyoga
Functions: find ls xargs

added alias in ~/.bashrc

alias lf='find ./* -ctime -1 | xargs ls -ltr --color'

ifconfig eth0 down hw ether (newmacaddresshere) && ifconfig eth0 up && ifconfig eth0 (newipaddresshere) netmask up && /bin/hostname (newhostnamehere)
2009-06-04 20:25:49
User: localGhost
Functions: ifconfig

The command above has been changed due to very good constructive criticism - thanks x 2! This command can be used after acquiring mac's, ip's and hostname's or any of the above from a freshly scanned LAN. User must be root, and remember to change your settings on your network managing software manually (Fedc10 NetworkManager Applet 0.7.1 is mine) instead of 'auto DHCP'. You can also substitute eth0 for wlan0 etc - be good and ENJOY!

enscript -E --color -t "title" -w html --toc -p /PATH/to/output.html /var/log/*log
2009-06-04 13:36:02
User: ncaio

Requires the "enscript" package.

[email protected]:~# sudo apt-get install enscript

Or http://www.codento.com/people/mtr/genscript/

"use your head"

ntpdate pool.ntp.org && hwclock --systohc && hwclock --adjust
2009-06-04 13:35:14
User: Weboide
Functions: hwclock
Tags: time sync ntp clock

Do not run this command if you already have ntpd running!

This needs to run as root, for example with sudo:

sudo ntpdate pool.ntp.org && sudo hwclock --systohc && sudo hwclock --adjust

This command will fetch accurate time from NTP servers and synchronize your system clock, then it will use the system clock to synchronize your hardware clock, and will calculate the time drift.

export http_proxy=<user>:<pass>@<server>:<port> ftp_proxy=<user>:<pass>@<server>:<port>
sudo ifconfig eth0 hw ether 00:01:02:03:04:05
2009-06-04 09:02:35
User: momitov
Functions: ifconfig sudo

eth0 = the name of the interface

00:01:02:03:04:05 = the new mac adresse

the same thing for wireless card $ sudo iwconfig eth1 hw ether 00:01:02:03:04:05

recode UTF8..UTF-16LE linux-utf8-file.txt
2009-06-04 08:53:51
User: greppo

Convert file from the UTF8 encoding used on Linux (has no "EF BB BF" byte order mark at the start) to the UTF-16 encoding used on Windows (has an "FF FE" byte order mark at the start).

Thanks to commenter: previous iconv command was the obsolete way to do it.

if [ -z $(echo $var | grep [0-9]) ]; then echo "NON NUMERIC"; fi
2009-06-04 07:41:26
User: AnusJenkins
Functions: echo grep

use to execute a block of code only if $var is numeric

lshw -html > hardware.html
2009-06-04 07:14:03
User: flart

After the command is done, open the html file in a browser

find . -name "*jpg" -exec jpeginfo -c {} \; | grep -E "WARNING|ERROR"
2009-06-03 22:08:48
User: vincentp
Functions: find grep

Finds all corrupted jpeg files in current directory and its subdirectories. Displays the error or warning found.

The jpeginfo is part of the jpeginfo package in debian.

Should you wish to only get corrupted filenames, use cut to extract them :

find ./ -name *jpg -exec jpeginfo -c {} \; | grep -E "WARNING|ERROR" | cut -d " " -f 1
awk '/match/{print NR}' file
sed -n -e '1,/match/p'
URL=http://svn.example.org/project; diff -u <(TZ=UTC svn -q log -r1:HEAD $URL | grep \|) <(TZ=UTC svn log -q $URL | grep \| | sort -k3 -t \|)
2009-06-03 14:26:55
User: sunny256
Functions: diff grep sort
Tags: bash svn

Lists revisions in a Subversion repository with a timestamp that doesn't follow the revision numbering order. If everything is OK, nothing is displayed.

while (( $i != 0 )) { smbstatus; sleep 5; clear }
2009-06-03 13:26:30
Functions: clear sleep
Tags: unix samba zsh

See smbstatus Output within a 5 second interval (for monitoring smb access)

find /var/log -type f -exec file {} \; | grep 'text' | cut -d' ' -f1 | sed -e's/:$//g' | grep -v '[0-9]$' | xargs tail -f
2009-06-03 09:47:08
User: mohan43u
Functions: cut file find grep sed tail xargs
Tags: tail

Works in Ubuntu, I hope it will work on all Linux machines. For Unixes, tail should be capable of handling more than one file with '-f' option.

This command line simply take log files which are text files, and not ending with a number, and it will continuously monitor those files.

Putting one alias in .profile will be more useful.

for k in `git branch|perl -pe s/^..//`;do echo -e `git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k|head -n 1`\\t$k;done|sort -r
2009-06-03 08:25:00
User: brunost
Functions: echo head perl sort

Print out list of all branches with last commit date to the branch, including relative time since commit and color coding.