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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.




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Terminal - All commands - 12,018 results
alias noc="awk 'NF && ! /^[[:space:]]*#/'"
2014-09-07 00:50:57
User: pooderbill
Functions: alias

The shortest and most complete comment/blank line remover...

Any line where the first non-whitespace character is # (ie, indented # comments), and all null and blank lines are removed. Use the alias as a filter:

noc /etc/hosts


grep server /etc/hosts | noc

Change to nawk depending awk versions.

convert input.png -alpha set -channel A -fx 0.5 output.png
tar -cpf - ./sourceFile | tar -xpf - -C ./targetDir/
ifconfig | head -n 2 | tr -d '\n' | sed -n 's/.*\(00:[^ ]*\).*\(adr:[^ ]*\).*/mac:\1 - \2/p'
git stash save --keep-index
( eval $(grep -z '^DBUS_SESSION_BUS_ADDRESS' /proc/$(pgrep -u $USER plasma-overlay)/environ); export DBUS_SESSION_BUS_ADDRESS; kquitapp plasma-overlay )
2014-09-01 12:49:58
User: mig_hg
Functions: eval export grep

So this first obtains address of the DBUS session, as it's not available by default over SSH. Then it tells plasma-overlay to exit. `kquitapp` is pretty much an equivalent of the qdbus calls.

SIZE=1; dd if=/dev/zero bs=1M count=$((SIZE*1024)) | pv -pters $((SIZE*1024*1024*1024)) | openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt > randomfile
2014-08-30 01:46:51
User: kennethjor
Functions: dd

SIZE is the number of gigabytes and the file name is at the end. Random data is generated by encrypting /dev/zero, similar to other techniques posted on here.

find -type f -exec ffprobe -i "{}" -show_entries format=duration -v quiet -of csv="p=0" \; | paste -sd+ | bc
2014-08-29 23:45:09
User: Hype
Functions: find paste

Recursive. Ignores non-media files. Requires ffprobe, paste, and bc.

function findOlderThan () { find . -mmin -$((($(date "+%s") - $(stat -c %Y $1))/60)) -type f ; }
2014-08-29 17:52:34
User: RobertDeRose
Functions: date find stat
Tags: find date stat

This function will find the modification time in unix_time of the given file, then calculate the number of minutes from now to then and then find all files modified in that range.

while true; do ps aux | sort -rk 3,3 | head -n 11 | cut -c -120 | netcat -l -p 8888 2>&1 >/dev/null; done &
2014-08-29 07:10:57
User: manumiu
Functions: cut head ps sort

If you want to see your top ten cpu using processes from the browser (e.g. you don't want to ssh into your server all the time for checking system load) you can run this command and browse to the machines ip on port 8888. For example

for i in chmod chown; do sudo "$i" --reference=/home/user/copyfromfile /tmp/targetfile; done
2014-08-28 15:08:32
User: zlemini
Functions: chmod sudo

Copy both perms and owner group from one file to another.

curl -sSi <URL> | sed '/^\r$/q'
2014-08-27 15:47:05
User: cbuckley
Functions: sed
Tags: curl http

Similar to the following:

curl -I <URL>

but curl -I performs a HEAD request, which can yield different results.

ogr2ogr -f GeoJSON output.geojson input.shp
finfd./ -name logs -type f -size 50
wget -qO- http://whatthecommit.com/index.txt | cowsay
2014-08-26 18:56:06
User: optyler
Functions: wget

No need to parse html page, website gives us a txt file :)

sprunge() { curl -F 'sprunge=<-' http://sprunge.us < "${1:-/dev/stdin}"; }
2014-08-26 17:47:31
User: malathion

echo "Hello world!" | sprunge # Redirect a stream to a pastebin

sprunge ~/.bashrc # Send a file to a pastebin

dd if=/dev/random count=1 bs=2 2>/dev/null | od -i | awk '{print $2}' | head -1
find . -type d -print0 | while read -d $'\0' dir; do cd "$dir"; echo " process $dir"; find . -maxdepth 1 -name "*.ogg.mp3" -exec rename 's/.ogg.mp3/.mp3/' {} \; ; cd -; done
2014-08-25 11:28:43
Functions: cd echo find read rename

This is probably overkill, but I have some issues when the directories have spaces in their names.


find . -type d -print0 | while read -d $'\0' dir; do xxx; done

loops over all the subdirectories in this place, ignoring the white spaces (to some extend).

cd "$dir"; echo " process $dir"; cd -;

goes to the directory and back. It also prints some info to check the progress.

find . -maxdepth 1 -name "*.ogg.mp3" -exec rename 's/.ogg.mp3/.mp3/' {} \;

renames the file within the current directory.

The whole should work with directories and file names that include white spaces.

curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"GUI.ShowNotification","params":{"title":"This is the title of the message","message":"This is the body of the message"},"id":1}' http://i3c.pla.lcl:8080/jsonrpc
2014-08-24 21:49:13
User: PLA

Send a text message to an Kodi (XBMC) device. Uses curl to post a JSON request to the Kodi JSON-RPC API.

ffmpeg -i input.mpg -deinterlace -pix_fmt yuv420p -vcodec libx264 -preset slow -vprofile high -trellis 2 -crf 20 -ac 2 -ab 192k -f mp4 -ss 5:00.000 -to 25:00.000 output.avi
netstat -anp | grep ":<port>"
tasklist /nh /fi "imagename eq notepad.exe" | findstr /i "notepad.exe" >nul && (echo Notepad is running)|| (Echo Notepad is not running)
2014-08-22 00:52:19
Functions: echo

There are many ways to do it on *nix. But on Windows, it's a bit convoluted.

I use the above command expression in a batch file to check if a process is running already before running it again. I use this is a batch file I created to switch between 2 different versions of PowerBuilder (PB). I wanted to make sure, one version of PB is not running, before letting the user to switch, hence this check. (replace notepad.exe with PB125.exe above).

/nh means no header, /fi means filter. We are filtering for Notepad.exe only above. Then, we take that and look for Notepad.exe using a FindStr command. It will still work, even if we don't have those 2 flags, but it makes finding the right program quicker.

&& and || are part of the conditional expressions see here: http://www.robvanderwoude.com/condexec.php. We use these to print for the IF...ELSE condition.

>nul is the equivalent of Unix /dev/null

Rest is self explanatory, I think.

cat /var/log/syslog | grep score= | awk '{print $15}' | more