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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 - 11,616 results
pbc () { parallel -C, -k -j100% "echo '$@' | bc -l"; }
2014-06-02 19:08:03
User: eroenj

Define a function that applies bc, the *nix calculator, with the specified expression to all rows of the input CSV. The first column is mapped to {1}, second one to {2}, and so forth. See sample output for an example. This function uses all available cores thanks to GNU Parallel.

Requires GNU Parallel

openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt < /dev/zero > randomfile.bin
2014-06-02 18:12:54
User: malathion

This command generates a pseudo-random data stream using aes-256-ctr with a seed set by /dev/urandom. Redirect to a block device for secure data scrambling.

for i in *; do identify $i | awk '{split($3,a,"x"); if (a[2]>a[1]) print $1;}'; done
2014-05-27 23:41:24
User: dmmst19
Functions: awk

Most people take photos in landscape orientation (wider than it is tall). Sometimes though you turn the camera sideways to capture a narrow/tall subject. Assuming you then manually rotate those picture files 90 degrees for proper viewing on screen or photo frame, you now have a mix of orientations in your photos directory.

This command will print out the names of all the photos in the current directory whose vertical resolution is larger than its horizontal resolution (i.e. portrait orientation). You can then take that list of files and deal with them however you need to, like re-rotating back to landscape for consistent printing with all the others.

This command requires the "identify" command from the ImageMagick command-line image manipulation suite. Sample output from identify:

identify PICT2821.JPG

PICT2821.JPG JPEG 1536x2048 1536x2048+0+0 8-bit DirectClass 688KB 0.016u 0:00.006

for d in `ls -d *`; do svn status $d | awk '{print $2}'; done | xargs ls -l {} \;
2014-05-27 19:07:45
User: dronamk
Functions: awk ls xargs

Find all files in SVN workspace directories which are uncommitted. List them and find their properties

autossh -M 3307 -f user@server.com -L 3307:
sed -i 's/^.*?].*?:\s//g' skype-chat-log.txt
2014-05-26 07:48:36
Functions: sed

Regular expression search pattern to remove the Datetime and Name when you paste from skype chat into your text editor

From this Gist:


MYURL=http://test.example.com ; awk -F/ '{ print $3 }' <<< $MYURL | awk -F. '{ if ( $(NF-1) == "co" || $(NF-1) == "com" ) printf $(NF-2)"."; print $(NF-1)"."$(NF); }'
2014-05-26 07:31:40
User: snafu
Functions: awk printf
Tags: bash url domain

Extracts domain and subdomain from given URl. See examples.

ruby -ruri -e 'u=URI(ARGV[0]).host.split("."); puts u[(u[-2] =~ /^com?$/ ? -3 : -2)..-1].join(".")' http://test.example.com
2014-05-25 18:43:44
User: wejn
Tags: ruby

Extracts 2nd-level domain part (or 3rd level, for co.* or com.*) from the URI's hostname. See sample output.

while true; do clear;awk '{a[$3]+=1};END{for(x in a){print x,a[x]}}' /proc/[0-9]*/stat; sleep 1; done
awk '$1=="Host"{$1="";H=substr($0,2)};$1=="HostName"{print H,"$",$2}' ~/.ssh/config | column -s '$' -t
2014-05-24 20:51:47
User: wejn
Functions: awk column
Tags: awk column

Spits out table that shows your Host->HostName aliases in ~/.ssh/config

alias pp='python -mjson.tool|pygmentize -l js'
2014-05-22 10:29:44
User: wires
Functions: alias
Tags: bash json

Leave out pygmentize or `pip install pygments` first.

while true; do clear; cat /proc/[0-9]*/stat | cut -d' ' -f 3 | sort | uniq -c | awk '{print $2" "$1}'; echo '---'; sleep 1; done
ssh [remote-machine] "cat file" | xclip -selection c
2014-05-19 16:34:44
User: conga
Functions: ssh

ssh from local to remote and pipe output of file to the local clipboard

svn copy http://svnserver.com/svn/trunk/htdocs/CMS/views/module/scripts/modal/dialog-settings-items.phtml@3143 -r 3143 htdocs/CMS/views/module/scripts/modal/dialog-settings-items.phtml
2014-05-16 10:35:19
User: fabio

3143 is the latest revision with a file

ps -e -o pid,vsz,comm= | sort -n -k 2
2014-05-14 00:36:50
Functions: ps sort

left-most column is PID, middle is virtual memory being consumed, right-most is actual process.

for i in $(getent group|cut -d: -f1); do sudo usermod -a -G "$i" $USER; done
[ ! -d /squashed/usr ] && mkdir -p /squashed/usr/{ro,rw} ; mksquashfs /usr /squashed/usr/usr.sfs.new -b 65536 ; mv /squashed/usr/usr.sfs.new /squashed/usr/usr.sfs ; reboot
2014-05-10 06:01:06
User: mhs
Functions: mkdir mv

Periodically run the one-liner above if/when there are significant changes to the files in /usr/

= Before rebooting, add following to /etc/fstab : =

/squashed/usr/usr.sfs /squashed/usr/ro squashfs loop,ro 0 0 usr /usr aufs udba=reval,br:/squashed/usr/rw:/squashed/usr/ro 0 0

No need to delete original /usr/ ! (unless you don't care about recovery). Also AuFS does not work with XFS

spacecmd --server server softwarechannel_listlatestpackages softwarechannel.name | grep ^kernel-[[:digit:]]
$ date --date='@1268727836'
jhead -rgt file-name.jpg
du -hs file-name
alias gitlog='git log -10 --graph --date-order -C -M --pretty=format:"%C(yellow)%h%C(reset) - %C(bold green)%ad%C(reset) - %C(dim yellow)%an%C(reset) %C(bold red)>%C(reset) %C(white)%s%C(reset) %C(bold red)%d%C(reset) " --abbrev-commit --date=short'
2014-05-08 09:43:55
User: deklau
Functions: alias

Cool alias that show a a better Git log

git status --porcelain | sed -ne 's/^ M //p' | tr '\n' '\0' | tr -d '"' | xargs -0 vim
2014-05-08 08:36:27
User: uschrisf
Functions: sed tr xargs
Tags: vim git

Works even with spaces in filenames.

As an alias in .gitconfig:


editchanged = "!git status --porcelain | sed -ne 's/^ M //p' | tr '\\n' '\\0' | tr -d '\"' | xargs -0 vim"

ffmpeg -i input_file.mp4 -strict experimental output_file.webm
2014-05-08 01:45:33
User: angryunicorn
Tags: ffmpeg

If you're using the experimental vorbis encoder (homebrew version of libffmpeg)

find . -name '*.phtml' | xargs perl -pi -e 's/(?!(<\?(php|xml|=)))<\?/<\?php/g;'
2014-05-07 14:33:19
User: crashspeeder
Functions: find perl xargs

Tired of front end developers using short open tags in your views? This will replace all instances of