Hide

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.


If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Hide

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

Hide

News

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.
Hide

Tags

Hide

Functions

Commands using echo from sorted by
Terminal - Commands using echo - 1,259 results
while true; do curl -vsL -o /dev/null example.com 2>&1 | grep 503 > /dev/null || echo "OK: server is up."; sleep 8; done
echo -n "foo" | wc -c
for ((i=0; i>-1000; --i)); do echo "${!i}"; done
2013-05-30 02:52:46
User: liungkejin
Functions: echo
0

some numbers have strange output!

some numbers output nothing!

some numbers will kill your terminal! even logout when running in tty

but i don't know why! can anyone explain it to me?

echo $[RANDOM % 2]
echo $[RANDOM % 100] # range 0-99
2013-05-25 19:02:00
User: anapsix
Functions: echo
-2

use it to stagger cronjob or to get a random number

increase the range by replacing 100 with your own max value

ls -1 | while read file; do new_file=$(echo $file | sed s/\ /_/g); mv "$file" "$new_file"; done
for i in *.pdf; do echo --------$i-------; echo; pdftotext $i - | grep -i Yourpattern; done
2013-05-22 05:36:06
User: fangfufu
Functions: echo grep
Tags: grep pdf
0

This command is useful for searching through a whole folder worth of pdf files.

cat domainlist.txt | while read line; do echo -ne $line; whois $line | grep Expiration ; done | sed 's:Expiration Date::'
echo lowercaseword | tr '[a-z]' '[A-Z]'
git-createrepo() { repos_path='/srv/git/'; mkdir $repos_path$1; cd $repos_path$1; git init --bare; echo "Repository location: ssh://$USER@`cat /etc/HOSTNAME``pwd`"; cd -; }
2013-05-09 21:44:24
User: batandwa
Functions: cd echo init mkdir
Tags: git
-3

Creates a git repository in a predefined location.

find . -name .git -print0 | while read -d $'\0' g; do echo "$g"; cd "$g"; git gc --aggressive; cd -; done
2013-05-09 08:03:23
User: Tungmar
Functions: cd echo find read
0

git gc should be run on all git repositories every 100 commits. This will help do do so if you have many git repositories ;-)

ps -o rss= -C Chrome | (x=0; while read rss; do ((x+=$rss)); done; echo $((x/1024)))
ps -e -m -o user,pid,args,%mem,rss | grep Chrome | perl -ne 'print "$1\n" if / (\d+)$/' | ( x=0;while read line; do (( x += $line )); done; echo $((x/1024)) );
echo c > /proc/sysrq-trigger
2013-05-07 19:41:40
User: fangfufu
Functions: echo
Tags: kernel
0

Well, this is quite useful for testing if your hardware watchdog is working properly.

=() { echo $(($*)); }
2013-05-03 04:27:07
User: xlz
Functions: echo
3

POSIX compliant arithmetic evaluation.

= 10*2+3

find -maxdepth 1 -type d | while read dir; do echo $dir; echo cmd2; done
echo ?ls -l? | at midnight
echo ?ls -l? | at 10am Jul 21
for i in `pidof java`; do echo $i; ll /proc/$i; done;
2013-04-26 08:01:21
User: cuizhaohua
Functions: echo
0

list all java process info.

sudo su; sync; echo 3 > /proc/sys/vm/drop_caches
echo 'Etc/UTC' | tee /etc/timezone; dpkg-reconfigure --frontend noninteractive tzdata
2013-04-22 06:14:55
User: donatello
Functions: echo tee
0

Replace the first part of the command above with the appropriate timezone string. Eg: 'Europe/London' or for UTC - 'Etc/UTC'. The appropriate string can be found from https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

This is useful when your server is installed by a data centre (managed hardware, VPS, etc) and the timezone is not usually set to the one your prefer.

echo 'Dir.foreach("/usr/local/Cellar/cowsay/3.03/share/cows") {|cow| puts cow; system "fortune | cowsay -f /usr/local/Cellar/cowsay/3.03/share/cows/#{cow}" }' | ruby
2013-04-15 12:27:38
User: orkoden
Functions: echo
-1

Shows a list of all installed cows saying a fortune. Also lists the cows names. Pic your favorite cow!

Needs cowsay, fortune and ruby installed. The path only applies to OS X with cowsay installed using homebrew. On Linux it might be /usr/share/cowsay/cows/ or similar. Uses ruby just because.

OIFS=$IFS;IFS=$':';for i in $(cat -n /etc/passwd);do echo -n $i\ ** \ ;done
for i in $(objdump -d binary -M intel |grep "^ " |cut -f2); do echo -n '\x'$i; done;echo
apt-get install phpmyadmin; echo "Include /etc/phpmyadmin/apache.conf" >> /etc/apache2/apache2.conf; service apache2 restart
2013-04-06 16:20:55
User: ZEROF
Functions: apt echo install
0

This command will install phpmyadmin, set apache2 server and restart apache2. After running this command you can open phpmyadmin on http://yoursite.com/phpmyadmin