Commands using head sorted by votes

Commands using head (314)

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Find the 10 users that take up the most disk space

In OSX you would have to make sure that you "sudo -s" your way to happiness since it will give a few "Permission denied" errors before finally spitting out the results. In OSX the directory structure has to start with the "Users" Directory then it will recursively perform the operation. Your Lord and master, Mematron Show Sample Output
This is sample output - yours may be different.
```
19234	/Users/mematron
3	/Users/Shared
1	/Users/n00b
1	/Users/fignewton
1	/Users/spam
0	/Users/akira
```
1

sudo -s du -sm /Users/* | sort -nr | head -n 10

mematron · 2012-09-13 10:15:23 4
True Random Dice Roll
This is sample output - yours may be different.
1

echo $(</dev/urandom tr -dc 1-6 | head -c1)

unixmonkey40000 · 2012-09-21 08:38:51 7
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. Show Sample Output
This is sample output - yours may be different.
```
NH6wAL58sKSkqBNUwK
$6$6ZpaL7bakRyXzrpM$TVS4d217.BDjKLEnYkPBtpR8CwXes5HI6U2pcSEoB3x9xUbXVxacEhvlvKFCi4tftwxOJs.Comh7u.GiPvA6X1
```
1

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)"

cnyg · 2012-11-09 00:40:22 4
generate 30 x 30 matrix

Replaces hexdump with the more succint xxd, and the sed was unnecessarily complex.
This is sample output - yours may be different.
1

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

psifertex · 2013-02-19 22:18:52 4
Generate password
This is sample output - yours may be different.
1

tr -dc 'A-Za-z0-9!@#$%^&*' < /dev/urandom | fold -w 12 | head -n 1

opexxx · 2013-03-15 13:20:32 81

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. Show Sample Output

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

mpb · 2013-03-19 21:10:54 6

most used unix commands
This is sample output - yours may be different.
1

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

nesses · 2013-05-03 16:24:30 6
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}' Show Sample Output
This is sample output - yours may be different.
```
123.123.123.123
```
1

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

wsams · 2013-09-05 20:26:45 11

Prints the latest modified files in a directory tree recursively

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

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

fuats · 2013-10-03 21:58:51 9

Create a bunch of dummy text files
This is sample output - yours may be different.
1

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

BoxingOctopus · 2013-11-11 21:27:15 8
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)
This is sample output - yours may be different.
1

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

pdxdoughnut · 2013-11-12 00:36:10 9
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)" Show Sample Output
This is sample output - yours may be different.
```
HTTP request sent, awaiting response... 200 OK
Length: 211183464 (201M) [application/octet-stream]
Saving to: ?331.82-desktop-win8-win7-winvista-64bit-english-whql.exe?
```
1

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)"

lowjax · 2013-11-21 03:04:59 11
Find last reboot time

Specific to OSX. Show Sample Output
This is sample output - yours may be different.
```
kern.boottime = Wed Jan 22 00:41:33 2014
```
1

sysctl -a | grep boottime | head -n 1

lgarron · 2014-01-24 13:03:48 7
Find 10 largest files in git history
This is sample output - yours may be different.
1

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

qdrizh · 2014-06-25 07:37:24 6
Print the IP address and the Mac address in the same line

Print the IP address and the Mac address in the same line Show Sample Output
This is sample output - yours may be different.
```
mac:00:50:12:BD:5E:5B - adr:192.168.0.1
```
1

ifconfig | head -n 2 | tr -d '\n' | sed -n 's/.*$00:[^ ]*$.*$adr:[^ ]*$.*/mac:\1 - \2/p'

Koobiac · 2014-09-03 14:35:27 18

Top 30 History

Top 30 History Command line with histogram display Show Sample Output

history|awk '{print $2}'|sort|uniq -c|sort -rn|head -30|awk '!max{max=$1;}{r="";i=s=100*$1/max;while(i-->0)r=r"#";printf "%50s %5d %s %s",$2,$1,r,"\n";}'

injez · 2014-09-29 12:40:43 9

Monitor system load and print out top offending processes

This checks the system load every second and if it's over a certain threshold (.8 in this example), it spits out the date, system loads and top 4 processes sorted by CPU. Additionally, the \a in the first echo creates an audible bell.
This is sample output - yours may be different.
1

while sleep 1; do if [ $(echo "$(cat /proc/loadavg | cut -d' ' -f1) > .8 " | bc) -gt 0 ]; then echo -e "\n\a"$(date)" \e[5m"$(cat /proc/loadavg)"\e[0m"; ps aux --sort=-%cpu|head -n 5; fi; done

tyzbit · 2014-12-08 15:44:40 8
Find the date of the first commit in a git repository

Finds the date of the first commit in a git repository branch Show Sample Output
This is sample output - yours may be different.
```
Wed Jun 25
```
1

git rev-list --all|tail -n1|xargs git show|grep -v diff|head -n1|cut -f1-3 -d' '

binaryten · 2015-02-04 19:35:16 11
Most used commands from history (without perl)

I copied this (let's be honest) somewhere on internet and I just made it as a function ready to be used as alias. It shows the 10 most used commands from history. This seems to be just another "most used commands from history", but hey.. this is a function!!! :D Show Sample Output
This is sample output - yours may be different.
```
$ mosth
     1  86  8.6%  rpm
     2  64  6.4%  yum
     3  47  4.7%  echo
     4  36  3.6%  ip
     5  36  3.6%  cat
     6  35  3.5%  ls
     7  32  3.2%  cd
     8  27  2.7%  systemctl
     9  27  2.7%  journalctl
    10  25  2.5%  nano
```
1

mosth() { history | awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | grep -v "./" | column -c3 -s " " -t | sort -nr | nl | head -n10; }

nnsense · 2015-05-11 17:41:55 19
Printout a list of field numbers (awk index) from a CSV file with headers as first line.

Useful to identify the field number in big CSV files with large number of fields. The index is the reference to use in processing with commands like 'cut' or 'awk' involved. Show Sample Output
This is sample output - yours may be different.
```
$ cat file.csv
ID, EMPLOYEE, AGE, SALARY
2,Jack Sparrow,41,10000
3,Mr. Bean,55,12900
15,Kermit the frog,25,29300

$ head -1 file.csv | tr ',' '\n' | tr -d " " | awk '{print NR,$0}'
1 ID
2 EMPLOYEE
3 AGE
4 SALARY
```
1

head -1 file.csv | tr ',' '\n' | tr -d " " | awk '{print NR,$0}'

neomefistox · 2015-08-26 05:46:15 18
Grab the top 5 CLFUContest one-liners
This is sample output - yours may be different.
1

curl -sL http://goo.gl/3sA3iW | head -16 | tail -14

cadejscroggins · 2015-09-19 07:19:49 10
Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials Show Sample Output
This is sample output - yours may be different.
```
export AWS_ACCESS_KEY_ID="ASIAasdfghjkl"
export AWS_SECRET_ACCESS_KEY="Fasdfghjklasdfghjklasdfghjkl"
export AWS_SESSION_TOKEN="FasdfghjklasdfghjklasdfghjklFasdfghjklasdfghjklasdfghjklFasdfghjklasdfghjklasdfghjklFasdfghjklasdfghjklasdfghjklFasdfghjklasdfghjklasdfghjklFasdfghjklasdfghjklasdfghjklFasdfghjklasdfghjklasdfghjklFasdfghjklasdfghjklasdfghjkl+N1riOr0d/4egdx9BOgPvaxuVPc5ouPw2vdD2qg"
```
1

head -n1 | xargs -I {} aws sts get-session-token --serial-number $MFA_ID --duration-seconds 900 --token-code {} --output text --query [Credentials.AccessKeyId,Credentials.SecretAccessKey,Credentials.SessionToken]

keymon · 2016-04-12 10:57:00 45
Find top 10 largest files
This is sample output - yours may be different.
1

du -a /var | sort -n -r | head -n 10

zluyuer · 2016-05-27 04:05:08 12
Read random news on the internet

sort -R randomize the list. head -n1 takes the first.
This is sample output - yours may be different.
1

links `lynx -dump -listonly "http://news.google.com" | grep -Eo "(http|https)://[a-zA-Z0-9./?=_-]*" | grep -v "google.com" | sort -R | uniq | head -n1`

mogoh · 2016-07-26 12:54:53 15
Find last 50 modified files
This is sample output - yours may be different.
1

find / -path /proc -prune -o -type f -printf '%TY-%Tm-%Td %TT %p\n' | sort -r | head -50

sidneycrestani · 2016-11-20 02:45:01 13
‹ First < 3 4 5 6 7 > Last ›

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print crontab entries for all the users that actually have a crontab

This is how I list the crontab for all the users on a given system that actually have a crontab. You could wrap it with a function block and place it in your .profile or .bashrc for quick access. There's prolly a simpler way to do this. Discuss.

Easy to extend one-liner for cron scripts that automate filesystem checking

This one-liner is for cron jobs that need to provide some basic information about a filesystem and the time it takes to complete the operation. You can swap out the di command for df or du if that's your thing. The |& redirections the stderr and stdout to the mail command. How to configure the variables. TOFSCK=/path/to/mount FSCKDEV=/dev/path/device or FSCKDEV=`grep $TOFSCK /proc/mounts | cut -f1 -d" "` MAILSUB="weekly file system check $TOFSCK "

Insert a line at the top of a text file without sed or awk or bash loops

Just use '-' to use STDIN as an additional input to 'cat'

Backup files older than 1 day on /home/dir, gzip them, moving old file to a dated file.

Useful for backing up old files, custom logs, etc. via a cronjob.

Generate Random Text based on Length

Random text of length "$1" without the useless cat command.

reset an hanging terminal session

when your terminal session seems unrensponsive (this normally happen after outputting some binary data directly on your standard output) it may me saned by hitting: CTRL+J tput sgr0 CTRL+J Note: don't press the Enter key, just ctrl+j

Write on the console without being registered

just use a space to prevent commands from being recorded in bash's history on most systems

Replace underscores with spaces in filenames and dirnames, recursively into subdirs.

Everyone wants to take spaces out of filenames. Forget that. I want to put them back in. We've got tools and filesystems that support spaces, they look better, so I'm going to use them. Because of how find works I find I need to run this multiple times, if it's renaming subdirs. But it can be re-run without issues. I got this version of the command from a comment in this underscore-generating command. http://www.commandlinefu.com/commands/view/760/find-recursively-from-current-directory-down-files-and-directories-whose-names-contain-single-or-multiple-whitespaces-and-replace-each-such-occurrence-with-a-single-underscore. All I did was change the regex.

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Restore user,group and mod of an entire website

I often use it at my work, on an ovh server with root ssh access and often have to change mod after having finished an operation. This command, replace the user, group and mod by the one required by apache to work.

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Commands using head (314)

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