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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 - 11,620 results
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.

eval echo $(echoprint-codegen "/path/to/file.mp3"| jq ' .[0].metadata | "mp3info -a \"" + .artist + "\" -t \"" + .title + "\" -l \"" + .release + "\" \"" + .filename + "\"" ' ) | bash
2014-08-08 21:14:53
User: glaudiston
Functions: echo eval

echoprint identify your song, then return artist, song name and album name(release) in a JSON. jq parse it and mp3info set the data in your mp3 file.

of course it depends on:




You need to set the environment variable


You can use it with find, but probably will bypass the 120 request/minute of developer account key. So, use a sleep to do it.

Something like:

find -name \*.mp3 | while read $f; do eval echo $(echoprint-codegen "$f" | jq ' .[0].metadata | "mp3info -a \"" + .artist + "\" -t \"" + .title + "\" -l \"" + .release + "\" \"" + .filename + "\"" ' ) | bash; sleep 1; done
[ `curl 'http://crl.godaddy.com/gds5-16.crl' 2>/dev/null | openssl crl -inform DER -noout -nextupdate | awk -F= '{print $2}' | xargs -I{} date -d {} +%s` -gt `date -d '8 hours' +%s` ] && echo "OK" || echo "Expires soon"
2014-08-07 17:18:38
User: hufman
Functions: awk date echo xargs
Tags: openssl

Downloads a CRL file, determines the expiration time, and checks when it will expire

sudo dpkg -P $(dpkg -l yourPkgName* | awk '$2 ~ /yourPkgName.*/ && $1 ~ /.i/ {print $2}')
2014-08-06 22:40:32
User: wejn
Functions: awk sudo
Tags: dpkg purge

Recently in Debian Wheezy the dpkg command refuses to work with wildcards, so this is the one-liner alternative. (alternative to #13614)

svn merge -r 854:853 l3toks.dtx
(echo -e '\x06\x00\x00\x00\x00\x00\x01\x01\x00'; sleep 1)|nc -c $host 25565
sudo dpkg -P $(sudo dpkg -l yourPkgName* | awk '$2 ~ /yourPkgName.*/' | awk '$1 ~ /.i/' | awk '{print $2}')
2014-08-02 18:14:02
User: woohoo
Functions: awk sudo
Tags: dpkg purge

Recently in Debian Wheezy the dpkg command refuses to work with wildcards, so this is the one-liner alternative.

Mac OSX: ping -oc 30 > /dev/null && say "Google name server is up" || say "This host is down"
2014-08-01 15:44:57
User: raulyca
Functions: ping
Tags: ping beep

Audio acknowledgement for host availability.

When running the command from a Linux systems, you can use "festival" or "espeak" instead of "say".

tar cvzf - dir | ssh my_server 'tar xzf -'
find /var/log -type f -iregex '.*[^\.][^0-9]+$' -not -iregex '.*gz$' 2> /dev/null | xargs tail -n0 -f | ccze -A
2014-07-29 17:11:17
User: rubo77
Functions: find tail xargs
Tags: unix ccze logging

This will show all changes in all log files under /var/log/ that are regular files and don't end with `gz` nor with a number

awk -F: '{print $2}' access_log | sort | uniq -c
for a in $(seq 15); do (xset led 3);(xset -led 3);sleep .9;done
docker ps -q | xargs -n 1 docker inspect | jq '.[0].NetworkSettings.Ports +{} | map(select(. != null)[0].HostPort) | map("-L \(.):localhost:\(.)") ' | sed -n 's/.*"\(.*\)".*/\1/p' |xargs boot2docker ssh -N
for i in {1..100}; do convert -background lightblue -fill blue -size 100x100 -pointsize 24 -gravity center label:$i $i.jpg; done
grep -r "<script" | grep -v src | awk -F: '{print $1}' | uniq
2014-07-23 06:24:31
User: sucotronic
Functions: awk grep
Tags: PHP javascript

Useful to crawl where the javascript is declared, and extract it a common file. You can redirect it to a file to review item by item.

find -L -type l
2014-07-22 19:52:18
Functions: find

-L tells find to follow symbolic links, so -type l will only return links it can't follow (i.e., those that are broken).

find -type l -xtype l
netstat -tlpn | sort -t: -k2 -n
2014-07-22 14:08:01
User: hute37
Functions: netstat sort
Tags: netstat

Show TCP Listen ports sorted by number

(bugs: IPV6 addresses not supported)

mknod replypipe p; nc -k -lp 1234 < replypipe| nc -U /var/run/mysocket.sock > replypipe
2014-07-19 18:17:35
User: adimania
Functions: mknod

* Make a FIFO file named replypipe

* listen on 1234

* pass the request to unix socket

* unix socket will reply to replypipe

* replypipe will write reply to the client

man -Pcat urxvt | \ # see description for full command
2014-07-16 23:14:14
User: malathion
Functions: man

man -Pcat urxvt | sed -n '/th: b/,/^B/p'|sed '$d'|sed '/^ \{7\}[a-z]/s/^ */^/g' | sed -e :a -e 'N;s/\n/@@/g;ta;P;D' | sed 's,\^\([^@]\+\)@*[\t ]*\([^\^]\+\),! \2\n! URxvt*\1\n\n,g' | sed 's,@@\( \+\),\n\1,g' | sed 's,@*$,,g' | sed '/^[^!]/d' | tr -d "'\`"

Prints a precompiled list of options to add to your Xresources.

Provided by Charles Torvalds here: http://www.askapache.com/linux/rxvt-xresources.html#Output_RXVT_Resources

php -r 'echo json_encode( unserialize( file_get_contents( "php://stdin" ) ) );'
pssh -h RemoteHosts.txt -P -I < ~/LocalScript.sh
2014-07-14 16:02:12
User: zlemini

Runs a local script over ssh assuming ssh keys are in place.

-P argument prints results to stdout.

# Uses - https://code.google.com/p/parallel-ssh/

git log --name-status --oneline --all | grep -P "^[A|M|D]\s" | awk '{print $2}' | sort | uniq
cat "log" | grep "text to grep" | awk '{print $1}' | sort -n | uniq -c | sort -rn | head -n 100