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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 - 11,997 results
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
tail -1f /var/opt/fds/logs/TraceEventLogFile.txt.0 | grep <msisdn> | tee <test-case-id>.trace | tr '|' '\n'
2014-08-21 19:29:07
User: neomefistox
Functions: grep tail tee tr

This command allows to follow up a trace on SDP (CS5.2), at the same time as the trace records are stored in the file with "raw" format.

Trace files in native format are useful to filter the records before to translation from '|' to '\n'.


grep -v OP_GET <raw-records>.trace | tr '|' '\n'
rsync -av -f"+ */" -f"- *" [source] [dest]
sudo pip install rainbowstream && rainbowstream -iot
2014-08-20 06:45:16
User: DTVD
Functions: install sudo

Rainbow Stream is a smart and nice Twitter client on terminal.

Almost everything you can do with a GUI application can be done, even viewing an image.

- Tab-autocomplete, history browsing

- Beautiful built-in themes and custom configuration support

- Tweet's images directly on your terminal.

ffmpeg -acodec copy -vcodec copy -ss 00:05:00 -t 00:20:00 -i file.mp4 file_cropped.mp4
curl -L https://gist.github.com/westonruter/ea038141e46e017d280b/download | tar -xvz --strip-components=1
2014-08-19 22:19:44
User: westonruter
Functions: tar
Tags: gist


rm -rf directoryname
xrandr --output DVI-I-2 --mode 1920x1080 --output HDMI-0 --off --output DVI-I-1 --mode 1280x1024 --pos 1920x0
du -sm *| sort -nr | awk '{ size=4+5*int($1/5); a[size]++ }; END { print "size(from->to) number graph"; for(i in a){ printf("%d %d ",i,a[i]) ; hist=a[i]; while(hist>0){printf("#") ; hist=hist-5} ; printf("\n")}}'
2014-08-19 14:43:20
User: higuita
Functions: awk du sort
Tags: awk

This command makes a small graph with the histogram of size blocks (5MB in this example), not individual files. Fine tune the 4+5*int($1/5) block for your own size jumps : jump-1+jump*($1/jump)

Also in the hist=hist-5 part, tune for bigger or smaller graphs

getent hosts <host>
pwgen -CsyN 1 16
tr -dc '\x15-\x7e' < /dev/urandom| head -c 16 | paste
echo "bored of the awaiting moderation"
xclip -selection clipboard -o -t text/html | pandoc -f html -t markdown_github -
2014-08-18 20:47:46
User: keymon

I always wanted to be able to copy formatted HTML, like from emails, on trello cards or READMEs... but the formatting is always wrong... But from this two links:

* https://jeremywsherman.com/blog/2012/02/08/pasting-html-into-markdown/

* http://stackoverflow.com/questions/3261379/getting-html-source-or-rich-text-from-the-x-clipboard

For instance, to to copy an formatted email to a trello card, just:

1. Select the email body

2. run: xclip -selection clipboard -o -t text/html | pandoc -f html -t markdown_github - | xclip -i -t text/plain

3. Paste in your trello card

4. Profit!


tail -f FILE | ccze
YEAR=2015; echo Jul $(ncal 7 $YEAR | awk '/^Fr/{print $NF}')
2014-08-17 11:12:09
User: andreasS
Functions: awk echo
Tags: awk date

Calculate the date of Sysadmin day (last Friday of July) of any given year

YEAR=2015; date -d${YEAR}0801-$(date -d${YEAR}0801+2days +%u)days +%b\ %e
2014-08-17 11:06:25
User: andreasS
Functions: date
Tags: date

Calculate Sysadmin day of any given year using 2 `date`. Code based on http://stackoverflow.com/a/5656859/196133

YEAR=2015; ncal 7 $YEAR | sed -n 's/^Fr.* \([^ ]\+\) *$/Jul \1/p'
2014-08-17 11:04:02
User: andreasS
Functions: sed
Tags: sed date

Calculate the date of Sysadmin day (last Friday of July) of any given year

awp () { awk '{print $'$1'}'; }
if [ "`curl -s --head domain.tld | grep HTTP | cut -d" " -f2`" != "200" ];then echo "error"; echo "doing else" ;fi
grep Failed auth.log | rev | cut -d\ -f4 | rev | sort -u
2014-08-14 14:57:41
User: supradave
Functions: cut grep rev sort

Find the failed lines, reverse the output because I only see 3 indicators after the IP address, i.e. port, port#, ssh2 (in my file), cut to the 4th field (yes, you could awk '{print $4}'), reverse the output back to normal and then sort -u (for uniq, or sort | uniq).

echo 1 > /proc/sys/sunrpc/nfs_debug
2014-08-12 14:40:55
User: harpo
Functions: echo

echo 1 > /proc/sys/sunrpc/nfs_debug && tail -f /var/log/messages

to debug NFS issues.