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 - 256 results

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

shuf /usr/share/dict/words |grep "^[^']\{3,6\}$" |head -n4 | sed -e "s/\b$.$/\u\1/g" | tr -d '\n'; echo

2013-09-06 03:05:31

User: chijonutor

Functions: grep head sed tr

Tags: tr xkcd shuf

Up
Down

Generate an XKCD #936 style 4 word password

Took one of the samples, added capitalization and removes in between spaces.

The final "echo" is just for readability.

Cheers

host example.com | head -1 | awk '{print $4}'

2013-09-05 22:20:49

User: wes

Functions: awk head host

Tags: awk tail ip address nslookup url

Up
Down

Get IP address from domain

nslookup www.example.com | tail -2 | head -1 | awk '{print $2}'

2013-09-05 20:26:45

User: wsams

Functions: awk head nslookup tail

Tags: awk tail ip address nslookup url

Up
Down

Get IP address from domain

I'm not sure how reliable this command is, but it works for my needs. Here's also a variant using grep.

nslookup www.example.com | grep "^Address: " | awk '{print $2}'

psgrep() { ps aux | tee >(head -1>&2) | grep -v " grep [email protected]" | grep "[email protected]" -i --color=auto; }

2013-08-02 12:44:32

User: fnl

Functions: grep head ps tee

Tags: grep ps

Up
Down

psgrep(command)

Pipes the header row of ps to STDERR, then greps for the command on the output of ps, removing the grep entry before that.

find /logs -ls -xdev | sort -nrk 7 | head -10

2013-07-22 08:36:03

User: vidya99343

Functions: find head sort

Up
Down

Find Largest files of mount point

bash-3.2$ find /logs -ls -xdev | sort -nrk 7 | head -10

1761905 205380 -rwxrwxr-x 1 wsadmin logadmin 210095353 Jul 22 01:33 /logs/intlpymt/Trace.log

652689 187360 -rwxrwxr-x 1 wsadmin logadmin 191663182 Jul 21 23:00 /logs/websphere/wsfpp1lppwa1213omsecureServer/SystemOut_13.07.21_23.00.12.log

2380449 186536 -rwxrwxr-x 1 wsadmin logadmin 190819939 Jul 16 14:03 /logs/omset/traceIntl.log.201307161403.lppwa1213.gz

2119524 183888 -rwxrwxr-x 1 wsadmin logadmin 188110111 Jul 22 01:33 /logs/intlpymt/intlpymtria/Trace.log

652816 160332 -rwxrwxr-x 1 wsadmin logadmin 164011871 Aug 14 2012 /logs/websphere/wsfpp1lppwa1213omsecureServer/SystemOut.log_08142012.gzip

653312 128916 -rwxrwxr-x 1 wsadmin logadmin 131873943 Jul 18 10:49 /logs/websphere/heapdump.20130718.104150.27592.0006.phd.201307181406.lppwa1213.gz

653320 128916 -rwxrwxr-x 1 wsadmin logadmin 131873735 Jul 18 10:40 /logs/websphere/heapdump.20130718.104012.27592.0002.phd.201307181406.lppwa1213.gz

653309 128912 -rwxrwxr-x 1 wsadmin logadmin 131867602 Jul 18 10:46 /logs/websphere/heapdump.20130718.104008.27592.0001.phd.201307181405.lppwa1213.gz

653323 128872 -rwxrwxr-x 1 wsadmin logadmin 131828157 Jul 18 10:41 /logs/websphere/heapdump.20130718.104109.27592.0004.phd.201307181407.lppwa1213.gz

652783 120288 -rwxrwxr-x 1 wsadmin logadmin 123047750 Aug 13 2012 /logs/websphere/wsfpp1lppwa1213omsecureServer/SystemOut.log_0813.2012.gzip

bash-3.2$

find /logs -ls -xdev | sort -nrk 7 | head -10

2013-07-22 08:34:28

User: vidya99343

Functions: find head sort

Up
Down

Find Largest files of mount point

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

head -c20 /dev/urandom | xxd -ps

2013-07-16 10:14:21

User: opexxx

Functions: head

Tags: HEAD urandom

-1

Up
Down

20char long alpahnumeric "password"

20characters long alpahnumeric "password"

history | awk '{CMD[$4]++;count++;} END { for (a in CMD )print CMD[a] " " CMD[a]/count*100 "% " a }' | sort -nr | nl | column -t | head -n 10

2013-07-05 02:38:04

User: jasee

Functions: awk column head nl sort

Up
Down

statistic of the frequnce of your command from your history。

perhaps you should use CMD[$2] instead of CMD[$4]

du -xB M --max-depth=2 /var | sort -rn | head -n 15

2013-05-23 10:45:21

User: bouktin

Functions: du head sort

Tags: bash Linux du

Up
Down

list the top 15 folders by decreasing size in MB

awk '{print $1}' ~/.bash_history | sort | uniq -c | sort -rn | head -n 10

2013-05-03 16:24:30

User: nesses

Functions: awk head sort uniq

Tags: sort awk uniq head,

Up
Down

most used unix commands

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

awk '{ print $9 }' access.log | sort | uniq -c | sort -nr | head -n 10

2013-05-02 09:23:26

User: cuizhaohua

Functions: awk head sort uniq

Up
Down

top 10 of access log

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

cat -n install.log | head -88 | tac | head -n $(( 88 - 50 )) | tac

2013-05-02 08:39:54

User: cuizhaohua

Functions: cat head tac

Up
Down

cut log from line 50 to line 88

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

cat -n install | head -n 150 | tac | head -n 50 | tac

2013-05-02 08:11:04

User: cuizhaohua

Functions: cat head install tac

Up
Down

cut log with row number,like from row number to another row number.

cut log from row 100 to row 150.

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

awk '/Dec\/2012/ {print $1,$8}' logfile | grep -ivE '(.gif|.jpg|.png|favicon|.css|.js|robots.txt|wp-l|wp-term)' | sort | uniq -c | sort -rn | head -n 20

2013-04-30 06:51:47

User: vaaclav

Functions: awk grep head sort uniq

Up
Down

find top 20 results in apache statistics for a specific month

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

rpm -qa --queryformat '%{size} %{name}-%{version}-%{release}\n' | sort -k 1,1 -rn | nl | head -16

2013-03-19 21:10:54

User: mpb

Functions: head nl rpm sort

Up
Down

Display 16 largest installed RPMs in size order, largest first

Interesting to see which packages are larger than the kernel package.

Useful to understand which RPMs might be candidates to remove if drive space is restricted.

find . -type f -exec ls -s {} \; | sort -n -r | head -5

2013-03-19 12:16:24

User: opexxx

Functions: find head ls sort

Tags: sort find head,

-3

Up
Down

Find top 5 big files

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

tr -dc '[email protected]#$%^&*' < /dev/urandom | fold -w 12 | head -n 1

2013-03-15 13:20:32

User: opexxx

Functions: fold head tr

Up
Down

Generate password

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

xxd -p /dev/urandom |fold -60|head -30|sed 's/$..$/\1 /g'

2013-02-19 22:18:52

User: psifertex

Functions: fold head sed

Up
Down

generate 30 x 30 matrix

Replaces hexdump with the more succint xxd, and the sed was unnecessarily complex.

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

hexdump -v -e '"%u"' </dev/urandom|fold -60|head -n 30|sed 's/$.\{2\}$/\1 /g'

2013-02-16 12:56:24

User: knoppix5

Functions: fold head hexdump sed

Up
Down

generate 30 x 30 matrix

od /dev/urandom -w60 -An|sed 's/ ..../ /g'|head -n 30

(this one lacks digits 8 and 9)

Comments (7) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

finger `whoami` | awk -F: '{ print $3 }' | head -n1 | sed 's/^ //'

2013-01-03 20:19:03

User: andrew_duffy

Functions: awk finger head sed

Up
Down

Get user's full name in Mac OS X

Comments (5) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

48 function gbl() { git for-each-ref --sort=-committerdate --format='%(committerdate) %(authorname) %(refname)' refs/remotes/origin/|grep -e "[email protected]"|head -n 10; }

2012-12-13 23:35:06

User: soheil

Functions: grep head

Tags: git remote quick branch

Up
Down

List Remote Git Branches By Author

Place in .bash_profile

du . | sort -nr | awk '{split("KB MB GB TB", arr); idx=1; while ( $1 > 1024 ) { $1/=1024; idx++} printf "%10.2f",$1; print " " arr[idx] "\t" $2}' | head -25

2012-12-03 02:59:13

User: agas

Functions: awk du head printf sort

Up
Down

List the size (in human readable form) of all sub folders from the current location

Lists the size in human readable form and lists the top 25 biggest directories/files

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

seq 10| shuf | head -1

2012-11-21 03:57:02

User: sandeepvreddy

Functions: head seq

Up
Down

Generate random number with shuf

Above command will generate a random number between 1 to 10.

cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 18 | head -1 | python -c "import sys,crypt; stdin=sys.stdin.readline().rstrip('\n'); print stdin;print crypt.crypt(stdin)"

2012-11-09 00:40:22

User: cnyg

Functions: cat fold head python tr

Tags: bash password python sha512

Up
Down

Generate a 18 character password, print the password and sha512 salted hash

Generate a 18 character password from character set a-zA-Z0-9 from /dev/urandom, pipe the output to Python which prints the password on standard out and in crypt sha512 form.

< 1 2 3 4 5 > Last ›