Commands using head | commandlinefu.com

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.

Get involved!

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

OpenID

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

UpGuard checks and validates configurations for every major OS, network device, and cloud provider.

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using head

Hide

News

May 19, 2015 - A Look At The New Commandlinefu: I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management: I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Hide

Top Tags

awk, bash, curl, find, grep, Linux, sed

Hide

Functions

Terminal - Commands using head - 255 results

git verify-pack -v .git/objects/pack/pack-*.idx | grep blob | sort -k3nr | head | while read s x b x; do git rev-list --all --objects | grep $s | awk '{print "'"$b"'",$0;}'; done

2014-06-25 07:37:24

User: qdrizh

Functions: awk grep head read sort

Up
Down

Find 10 largest files in git history

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

mco ping | head -n -4 | awk '{print $1}' | sort

2014-06-24 18:20:16

User: mrwulf

Functions: awk head ping

Tags: sort awk HEAD mco mcollective marionette-collective

Up
Down

Show an alphabetized list of all mcollective nodes

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

du -a | sort -nr | head -10

2014-06-10 13:00:27

User: compguy925

Functions: du head sort

Up
Down

Find directories in pwd, get disk usage, sort results

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

psql -h <SERVER NAME HERE> -t -c 'SELECT version();' |head -1

2014-04-25 08:26:23

User: hxre

Functions: head

Tags: bash Linux postgresql

Up
Down

Get a PostgreSQL servers version

-t, --tuples-only print rows only

history |awk '{print $3}' |awk 'BEGIN {FS="|"} {print $1}'|sort|uniq -c |sort -rn |head -10

2014-04-20 06:40:56

User: cypggs

Functions: awk head sort uniq

Up
Down

最常使用的10个命令

google() { Q="$@"; GOOG_URL='https://www.google.com/search?q='; AGENT="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.152 Safari/537.36" elinks -dump "${GOOG_URL}${Q//\ /+}" | grep "\*" | head -1 }

2014-04-17 07:37:25

User: runvnc

Functions: grep head

Tags: google

Up
Down

Return the one-liner google response for queries like "12*24" or "what time is it in the uk"

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

du -hsx * | sort -rh | head -10

2014-04-14 17:54:23

User: mirams

Functions: du head sort

Tags: disk usage folder folder size

Up
Down

Provide the ten largest subfolders in the current folder

Comments (4) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;

2014-04-07 10:07:22

User: opexxx

Functions: head tr

Up
Down

16 Character Random Password

This snippet will produce an alpha-numeric 16 character password

echo $(sudo lshw -businfo | grep -B 1 -m 1 $(df "/path/to/file" | tail -1 | awk '{print $1}' | cut -c 6-8) | head -n 1 | awk '{print $1}' | cut -c 5- | tr ":" "-") | sudo tee /sys/bus/usb/drivers/usb/unbind

2014-04-06 12:06:29

User: tweet78

Functions: awk cut df echo grep head sudo tail tee tr

Tags: usb filename filepath

Up
Down

Given a file path, unplug the USB device on which the file is located (the file must be on an USB device !)

You have an external USB drive or key.

Apply this command (using the file path of anything on your device) and it will simulate the unplug of this device.

If you just want the port, just type :

echo $(sudo lshw -businfo | grep -B 1 -m 1 $(df "/path/to/file" | tail -1 | awk '{print $1}' | cut -c 6-8) | head -n 1 | awk '{print $1}' | cut -c 5- | tr ":" "-")

VAR=$(head -5)

2014-04-05 13:45:18

User: rodolfoap

Functions: head

Tags: read stdin head,

-2

Up
Down

Multiline read

Reads n lines from stdin and puts the contents in a variable. Yes, I know the read command and its options, but find this logical even for one line.

function brainwallet_exponent () { printf %s "$1"|sha256sum|head -c 64; }

2014-02-18 01:49:09

User: nixnax

Functions: head printf

Tags: openssl redirection substitution printf sha256 bitcoin brainwallet

Up
Down

Bitcoin Brainwallet Exponent Calculator

A bitcoin "brainwallet" is a secret passphrase you carry in your brain.

The Bitcoin Brainwallet Exponent Calculator is one of three functions needed to calculate the bitcoin PRIVATE key. Roughly, the formula is exponent = sha256 (passphrase)

Note that this is a bash function, which means you have to type its name to invoke it.

You can check the accuracy of the results here http://brainwallet.org

cat /dev/urandom | env LC_CTYPE=C tr -dc a-zA-Z0-9 | head -c 16; echo

2014-02-05 15:04:07

User: yakovlev

Functions: cat env head tr

Tags: password random generate mac os x

Up
Down

Generate random password on Mac OS X

Feel free to put this in your ~/.profile:

random(){ cat /dev/urandom | env LC_CTYPE=C tr -dc $1 | head -c $2; echo; }

Then use it to generate passwords:

random [:alnum:] 16

Or DNA sequences:

random ACGT 256

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

wget -q -O- http://bitinfocharts.com/markets/btc-e/btc-usd.html |grep -o -P 'lastTrade">([0-9]{1,})(.){0,1}[0-9]{0,}' |grep -o -P '(\d)+(\.){0,1}(\d)*' |head -n 1

2014-01-25 23:40:00

User: peter1337

Functions: grep head wget

Tags: wget grep bitcoin btc

Up
Down

grep BTC last trading price from BTC-E, but u can change it.. they got em all

sysctl -a | grep boottime | head -n 1

2014-01-24 13:03:48

User: lgarron

Functions: grep head sysctl

Tags: osx

Up
Down

Find last reboot time

Specific to OSX.

phpunit --log-json php://stdout | awk '$NF ~ '/,/' && $1 ~ /"(test|time)"/' | cut -d: -f2- | sed "N;s/\n/--/" | sed "s/,//"| awk 'BEGIN{FS="--"}; {print $2 $1}' | sort -r | head -n 5

2014-01-24 12:50:02

User: adri

Functions: awk cut head sed sort

Tags: PHP phpunit

Up
Down

PHPUnit: Show the 5 slowest tests with their runtime

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

curl -s -k https://www.kernel.org/feeds/kdist.xml | sed -n -e 's@.*<guid>$.*$</guid>.*@\[email protected]' | grep 'stable' | head -1 | awk -F , '{print $3}'

2013-12-17 23:59:27

User: Wafelijzer

Functions: awk grep head sed

Tags: kernel

Up
Down

Get current stable kernel version string from kernel.org

Fetches latest stable release version from first entry between tags

wget "us.download.nvidia.com$(wget -qO- "$(wget -qO- "nvidia.com/Download/processFind.aspx?psid=95&pfid=695&osid=19&lid=1&lang=en-us"|awk '/driverResults.aspx/ {print $4}'|cut -d "'" -f2|head -n 1)"|awk '/url=/ {print $2}'|cut -d '=' -f3|cut -d '&' -f1)"

2013-11-21 03:04:59

User: lowjax

Functions: awk cut head wget

Tags: windows sed awk wget cut nvidia drivers x64 geforce

Up
Down

Download latest NVIDIA Geforce x64 Windows driver

Download latest NVIDIA Geforce x64 Windows7-8 driver from Nvidia's website. Pulls the latest download version (which includes beta). This is the "English" version. The following command includes a 'sed' line to replace "english" with "international" if needed. You can also replace the starting subdomain with "eu." "uk." and others. Enjoy this one liner! 1 character under the max :)

wget "us.download.nvidia.com$(wget -qO- "$(wget -qO- "nvidia.com/Download/processFind.aspx?psid=95&pfid=695&osid=19&lid=1&lang=en-us" | awk '/driverResults.aspx/ {print $4}' | cut -d "'" -f2 | head -n 1)" | awk '/url=/ {print $2}' | sed -e "s/english/international/" | cut -d '=' -f3 | cut -d '&' -f1)"

base64 /dev/urandom | head -c 33554432 | split -b 8192 -da 4 - dummy.

2013-11-12 17:56:23

User: pdxdoughnut

Functions: head split

Tags: random split base64 dummy file, null file, test file /dev/urandom

Up
Down

Create a bunch of dummy text files

Avoiding a for loop brought this time down to less than 3 seconds on my old machine. And just to be clear, 33554432 = 8192 * 4086.

Comments (6) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

for i in {1..4096}; do base64 /dev/urandom | head -c 8192 > dummy$i.rnd ; done

2013-11-12 00:36:10

User: pdxdoughnut

Functions: head

Tags: random base64 for loop dummy file, null file, test file /dev/urandom

Up
Down

Create a bunch of dummy text files

Using the 'time' command, running this with 'tr' took 28 seconds (and change) each time but using base64 only took 8 seconds (and change). If the file doesn't have to be viewable, pulling straight from urandom with head only took 6 seconds (and change)

Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

for i in `seq 1 4096`; do tr -dc A-Za-z0-9 </dev/urandom | head -c8192 > dummy$i.rnd; done

2013-11-11 21:27:15

User: TuxOtaku

Functions: head tr

Tags: random for loop dummy file, null file, test file /dev/urandom

Up
Down

Create a bunch of dummy text files

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

echo $(< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c10)

2013-11-07 21:51:38

User: santizo

Functions: echo head tr

Up
Down

Generate a random password.

Uses urandom and tr to generate a random password. Change the value of head -c## for the lenght of the password.

wget --no-check-certificate https://www.kernel.org/$(wget -qO- --no-check-certificate https://www.kernel.org | grep tar | head -n1 | cut -d\" -f2)

2013-11-07 18:46:14

User: glaudiston

Functions: cut grep head tar wget

Up
Down

Download current stable kernel version from kernel.org

Access www.kernel.org and download the last stable linux kernel release.

find . -name '*pdf*' -print0 | xargs -0 ls -lt | head -20

2013-10-03 21:58:51

User: fuats

Functions: find head ls xargs

Tags: last, modfiied find xargs

Up
Down

Prints the latest modified files in a directory tree recursively

Sorts by latest modified files by looking to current directory and all subdirectories

du -ah | sort -hr | head -n50 | cat -n

2013-10-01 10:16:13

User: rgregor

Functions: cat du head sort

Up
Down

Display a numbered list of 50 biggets files sorted by size (human readable)

head -c 24 /dev/urandom | base64

2013-09-28 16:32:47

User: henix

Functions: head

Tags: random

Up
Down

Generate a random password 30 characters long

Use less random number resources and less commands

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

< 1 2 3 4 > Last ›