Commands using head sorted by votes

Commands using head (314)

sorted by

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 46
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 ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. 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.

Share Your Commands

Check These Out

File rotation without rename command

Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Hypnosis

rather don't depend on those sleepin'pills http://en.wikipedia.org/wiki/Counting_sheep

Remove a range of lines from a file

Generate Random Passwords

If you want a password length longer than 6, changing the -c6 to read -c8 will give you 8 random characters instead of 6. To end up with a line-feed, use this with echo: # echo `< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c6` Modern systems need higher strenght, so add some special characters: # < /dev/urandom tr -dc '12345!@#$%qwertQWERTasdfgASDFGzxcvbZXCVB' | head -c8

Mount/unmount your truecrypted file containers

This should automatically mount it to /media/truecrypt1. Further mounts will go to /media/truecrypt2, and so on. You shouldn't need sudo/su if your permissions are right. I alias tru='truecrypt' since tr and true are commands. To explicitly create a mount point do: tru volume.tc /media/foo To make sure an GUI explorer window (nautilus, et al) opens on the mounted volume, add: --explorer To see what you currently have mounted do: tru -l To dismount a volume do: tru -d volume.tc. To dismount all mounted volumes at once do: tru -d Tested with Truecrypt v6.3a / Ubuntu 9.10

Easy Persistent SSH Connections Using Screen

Use as: $ s host1 Will ssh to remote host upon first invocation. Then use C-a d to detatch. Running "s host1" again will resume the shell session on the remote host. Only useful in LAN environment. You'd want to start the screen on the remote host over a WAN. Adapted from Hack 34 in Linux Server Hacks 2nd Addition.

Zip each file in a directory individually with the original file name

This will list the files in a directory, then zip each one with the original filename individually. video1.wmv -> video1.zip video2.wmv -> video2.zip This was for zipping up large amounts of video files for upload on a Windows machine.

IBM AIX: Extract a .tar.gz archive in one shot

This command is for UNIX OSes that have plain vanilla System V UNIX commands instead of their more functional GNU counterparts, such as IBM AIX.

Check which files are opened by Firefox then sort by largest size.

Just refining last proposal for this check, showing awk power to make more complex math (instead /1024/1024, 2^20). We don't need declare variable before run lsof, because $(command) returns his output. Also, awk can perform filtering by regexp instead to call grep. I changed the 0.0000xxxx messy output, with a more readable form purging all fractional numbers and files less than 1 MB.

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.

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

Commands using head (314) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using head (314)

sorted by