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 head from sorted by
Terminal - Commands using head - 242 results
head -n 13 /etc/services | tail -n 1
2011-09-15 19:39:49
User: muonIT
Functions: head tail
Tags: goto
-5

Silly approach, but easy to remember...

sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep udp && echo && sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep tcp
less file.lst | head -n 50000 > output.txt
2011-09-05 05:26:04
User: Richie086
Functions: head less
-3

Useful for situations where you have word lists or dictionaries that range from hundreds of megabytes to several gigabytes in size. Replace file.lst with your wordlist, replace 50000 with however many lines you want the resulting list to be in total. The result will be redirected to output.txt in the current working directory. It may be helpful to run wc -l file.lst to find out how many lines the word list is first, then divide that in half to figure out what value to put for the head -n part of the command.

search="whatyouwant";data=$(grep "$search" * -R --exclude-dir=.svn -B2 -A2);for((i=$(echo "$data" | wc -l);$i>0;i=$(($i-6)) )); do clear;echo "$data"| tail -n $i | head -n 5; read;done
2011-08-29 18:14:16
User: Juluan
Functions: echo grep head tail wc
-2

Not perfect but working (at least on the project i wrote it ;) )

Specify what you want search in var search, then it grep the folder and show one result at a time.

Press enter and then it will show the next result.

It can work bad on result in the firsts lines, and it can be improved to allow to come back.

But in my case (a large project, i was checking if a value wasn't used withouth is corresponding const and the value is "1000" so there was a lot of result ...) it was perfect ;)

shuf /usr/share/dict/words |grep "^[^']\{3,5\}$" |head -n4
2011-08-24 03:43:55
User: menachem
Functions: grep head
Tags: awk xkcd
0

This does the same thing that the command 'j_melis' submitted, but does it a lot quicker.

That command takes 43 seconds to complete on my system, while the command I submitted takes 6 seconds.

cd $(ls -ltr|grep ^d|head -1|sed 's:.*\ ::g'|tail -1)
2011-08-10 03:39:35
Functions: cd grep head ls sed tail
-1

Replace the head -1 with head -n that is the n-th item you want to go to.

Replace the head with tail, go to the last dir you listed.

You also can change the parameters of ls.

alias cd1='cd $( ls -1t | grep ^d | head -1)'
head /dev/urandom | md5sum | base64
find /myfs -size +209715200c -exec du -m {} \; |sort -nr |head -10
2011-07-07 21:12:46
User: arlequin
Functions: du find head sort
2

Specify the size in bytes using the 'c' option for the -size flag. The + sign reads as "bigger than". Then execute du on the list; sort in reverse mode and show the first 10 occurrences.

cd $(ls -1t --color=never | head -1)
alias cd1='cd $( ls -lt | grep ^d | head -1 | cut -b 51- )'
head -n1 sample.txt | tail -n1
2011-06-14 17:45:04
User: gtcom
Functions: head tail
Tags: tail HEAD
-1

You can actually do the same thing with a combination of head and tail. For example, in a file of four lines, if you just want the middle two lines:

head -n3 sample.txt | tail -n2

Line 1 --\

Line 2 } These three lines are selected by head -n3,

Line 3 --/ this feeds the following filtered list to tail:

Line 4

Line 1

Line 2 \___ These two lines are filtered by tail -n2,

Line 3 / This results in:

Line 2

Line 3

being printed to screen (or wherever you redirect it).

history | tail -(n+1) | head -(n) | sed 's/^[0-9 ]\{7\}//' >> ~/script.sh
2011-06-08 13:40:58
Functions: head sed tail
1

Uses history to get the last n+1 commands (since this command will appear as the most recent), then strips out the line number and this command using sed, and appends the commands to a file.

find . -maxdepth 1 -printf '%A@\t%p\n' | sort -r | cut -f 2,2 | head -1
ls -t1 | head -n1
od /dev/urandom -w6 -tx1 -An|sed -e 's/ //' -e 's/ /:/g'|head -n 1
2011-05-16 15:05:34
User: karel1980
Functions: head od sed
1

Just increase the 1 at the end if you want to generate more than one.

(Alternative to "| head -n N" you could use the -b flag of od: -b $[6*N]

echo $(( $( date +%s ) - $( stat -c %Y * | sort -nr | head -n 1 ) ))
alias screenr='screen -r $(screen -ls | egrep -o -e '[0-9]+' | head -n 1)'
cut -f1 -d" " ~/.bash_history | sort | uniq -c | sort -nr | head -n 30
while true; do while [ `date +%H%M` == "1857" ] ; do sleep 1s; yes | head -n 2000 > /dev/dsp; done; done;
2011-04-23 14:44:26
User: mrwill
Functions: head sleep yes
-1

this command will beep like an alarm for one minute from 18:57. you can change "1857" to your desired time.

you should have alsa-oss package installed, and you should also be root or part of "audio" group.

function command_not_found_handle(){ apt-get install $( apt-file search "$1" | grep bin | grep -w "$1" | head -n1 | cut -d ':' -f 1 ) && $* ; }
2011-04-06 19:58:32
User: Juluan
Functions: cut grep head install
-7

Work only with bash and apt-file installed.

When it found an unknow command, it will search for a file named "scribus" (in my example), in a folder named bin and then install the corresponding package.

After installation, it will run the command.

Usefull juste after reinstalling linux and missing lot of package.

echo Selected $(ls -1 | sort -R | head -n 1)
ps -eo pmem,pid,comm --no-headers | sort -k1 -rn | head -10
2011-03-11 04:51:35
User: dexterhu
Functions: head ps sort
0

Pros: the format is very simple, there is no need to show every columns, and full command with args

the first column is memory consumption %

the second column is pid

the third is just the command (without full arguments, most application's arguments are too long)

You can decide which application to kill then.

env LC_CTYPE=C tr -dc "a-zA-Z0-9-_\$\?" < /dev/urandom | head -c 10
2011-02-22 17:09:44
User: aerickson
Functions: env head tr
0

Prepending

env LC_CTYPE=C

fixes a problem with bad bytes in /dev/urandom on Mac OS X

nice -n 5 electricsheep -window-id `xwininfo -root|head -n 2|grep xwininfo|cut -c 22-26`
2011-02-14 03:58:58
User: kbaegis
Functions: cut grep head nice
0

This is a simple command which makes electricsheep render directly to your background