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

All commands from sorted by
Terminal - All commands - 11,484 results
iotop
ps aux | grep [c]ommandname
nethogs
macchanger --random interface
2010-09-26 11:12:31
User: JulianTosh
Tags: sed openssl
-4

macchanger will allow you to change either 1) mfg code, 2) host id, or 3) all of the above. Use this at wifi hotspots to help reduce profiling.

printf "$string" | md5sum
files=(/usr/share/cowsay/cows/*); cowsay -f `echo ${files[$((RANDOM%${#files}))]}` <TEXT>
2011-02-20 05:43:01
User: lkjoel
-4

This will show a random cow with cowsay.

find . |more |grep -v filename |xargs rm
awk '{if (NR == 3) print}' <file>
2009-10-19 15:58:09
User: yooreck
Functions: awk
-5

I don't know if it's better but works fine :)

gawk '{n=$1;a=0;b=1;c=1;for(i=1;i<n;i++){c=a+b;a=b;b=c};print c}' << eof
2010-11-26 08:36:30
Functions: gawk
Tags: awk
-5

only take the first field on each row to compute the fibo on this number

find . -name "*.c" -exec sed -i "/\/sh/a\####################################\n#Date:2010-05-18\n#Company:XXXXX tech Co.\n#Author:Wangjunling\n#Copyright:gpl\n####################################" {} \;
iptables -F
removedir(){ read -p "Delete the current directory $PWD ? " human;if [ "$human" = "yes" ]; then [ -z "${PWD##*/}" ] && { echo "$PWD not set" >&2;return 1;}; rm -Rf ../"${PWD##*/}"/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; }
say `cat /path/to/textfile.txt`
p=$(netstat -nate 2>/dev/null | awk '/LISTEN/ {gsub (/.*:/, "", $4); if ($4 == "4444") {print $8}}'); for i in $(ls /proc/|grep "^[1-9]"); do [[ $(ls -l /proc/$i/fd/|grep socket|sed -e 's|.*\[\(.*\)\]|\1|'|grep $p) ]] && cat /proc/$i/cmdline && echo; done
2009-04-30 12:39:48
User: j0rn
Functions: awk cat grep ls netstat sed
-5

Ok so it's rellay useless line and I sorry for that, furthermore that's nothing optimized at all...

At the beginning I didn't managed by using netstat -p to print out which process was handling that open port 4444, I realize at the end I was not root and security restrictions applied ;p

It's nevertheless a (good ?) way to see how ps(tree) works, as it acts exactly the same way by reading in /proc

So for a specific port, this line returns the calling command line of every thread that handle the associated socket

netstat -nlput
wget -O - -q http://whatismyip.org/
2011-10-15 11:36:56
User: ztank1013
Functions: wget
-5

This just output your external IP, no extra characters at the end of line.

vim +143 filename.txt
man <command> then type h
2011-10-16 09:49:56
User: stanix
Functions: man type
-5

Read all chapters up to 'Jumping', improve your effectiveness of wirking in terminal.

Most useful are the Moving and Searching commands

watch 'ls -tr1 | tail -n1 | xargs tail'
2013-05-09 11:37:59
User: batandwa
Functions: tail watch xargs
Tags: tail ls xargs watch
-5

Watches for file modifications in the current directory and tails the file.

df -h
2009-07-08 11:25:28
User: Paaskehare
Functions: df
-5

Bulit-in function in linux, so should work on any linux distribution.

udhcpc -i eth0
zip -r -9 /var/www/html/project.zip /var/www/html/project
date | md5sum
find . -type d -name 'CVS' | xargs rm -r
ls -1 static/images/ | while read line; do echo -n $line' '[; grep -rc $line *|grep -v ".svn"|cut -d":" -f2|grep -vc 0| tr "\n" -d; echo -n ]; echo ; done
2009-03-20 20:33:36
User: psytek
Functions: cut echo grep ls read tr
-5

This command will grep the entire directory looking for any files containing the list of files. This is useful for cleaning out your project of old static files that are no longer in use. Also ignores .svn directories for accurate counts. Replace 'static/images/' with the directory containing the files you want to search for.