Commands using head sorted by votes

Commands using head (314)

sorted by

Look for English words in /dev/urandom

* to get the English dictionary: wget http://www.mavi1.org/web_security/wordlists/webster-dictionary.txt Show Sample Output
This is sample output - yours may be different.
```
...
rINg
riNg
akAL
tais
TaRF
bASS
DoCK
raCe
...
```
7

head -100000 /dev/urandom | strings > temp.txt && for w in $(cat webster-dictionary.txt); do if [ ${#w} -gt 3 ]; then grep -io $w temp.txt; fi; done

rugina · 2010-12-23 01:58:56 11
Look for English words in /dev/urandom

Little faster alternative.
This is sample output - yours may be different.
7

head -100000 /dev/urandom | strings|tr '[A-Z]' '[a-z]'|sort >temp.txt && wget -q http://www.mavi1.org/web_security/wordlists/webster-dictionary.txt -O-|tr '[A-Z]' '[a-z]'|sort >temp2.txt&&comm -12 temp.txt temp2.txt

marssi · 2010-12-26 11:04:42 7
generate a randome 10 character password
This is sample output - yours may be different.
7

tr -dc A-Za-z0-9_ < /dev/urandom | head -c 10 | xargs

nottings · 2012-10-17 14:04:14 10
List latest 5 modified files recursively

The output format is given by the -printf parameter: %T@ = modify time in seconds since Jan. 1, 1970, 00:00 GMT, with fractional part. Mandatory, hidden in the end. %TY-%Tm-%Td %TH:%TM:%.2TS = modify time as YYYY-MM-DD HH:MM:SS. Optional. %p = file path Refer to http://linux.die.net/man/1/find for more about -printf formatting. ------------------------ sort -nr = sort numerically and reverse (higher values - most recent timestamp - first) head -n 5 = get only 5 first lines (change 5 to whatever you want) cut -f2- -d" " = trim first field (timestamp, used only for sorting) ------------------------ Very useful for building scripts for detecting malicious files upload and malware injections. Show Sample Output
This is sample output - yours may be different.
```
2016-03-22 06:16:03 ./www/sample.png
2016-03-22 02:30:32 ./http-logs/error.log
2016-03-11 01:48:14 ./wwww/index.php
2016-03-01 07:04:44 ./www/common/module.php
2016-02-25 02:47:29 ./readme.md
```
7

find . -type f -printf '%T@ %TY-%Tm-%Td %TH:%TM:%.2TS %p\n' | sort -nr | head -n 5 | cut -f2- -d" "

paulera · 2016-03-23 11:56:39 11
Print Memory Utilization Percentage For a specific process and it's children

Change the name of the process and what is echoed to suit your needs. The brackets around the h in the grep statement cause grep to skip over "grep httpd", it is the equivalent of grep -v grep although more elegant. Show Sample Output
This is sample output - yours may be different.
```
RAM Used By HTTP: 50.5000%
```
6

TOTAL_RAM=`free | head -n 2 | tail -n 1 | awk '{ print $2 }'`; PROC_RSS=`ps axo rss,comm | grep [h]ttpd | awk '{ TOTAL += $1 } END { print TOTAL }'`; PROC_PCT=`echo "scale=4; ( $PROC_RSS/$TOTAL_RAM ) * 100" | bc`; echo "RAM Used by HTTP: $PROC_PCT%"

d34dh0r53 · 2010-02-26 20:29:45 9
Generate a random left-hand password

Generates a random 8-character password that can be typed using only the left hand on a QWERTY keyboard. Useful to avoid taking your hand off of the mouse, especially if your username is left-handed. Change the 8 to your length of choice, add or remove characters from the list based on your preferences or kezboard layout, etc.
This is sample output - yours may be different.
6

</dev/urandom tr -dc '12345!@#$%qwertQWERTasdfgASDFGzxcvbZXCVB' | head -c8; echo ""

TexasDex · 2010-06-17 19:30:36 4
download 10 random wallpapers from google

you may want &hl=en for &hl=es for the language you may want imgsz=xxlarge for imgsz=large or whatever filter you may want q=apples or whatever
This is sample output - yours may be different.
6

for i in {1..10};do wget $(wget -O- -U "" "http://images.google.com/images?imgsz=xxlarge&hl=en&q=wallpaper+HD&start=$(($RANDOM%900+100))" --quiet | grep -oe 'http://[^"]*\.jpg' | head -1);done

dzup · 2012-07-26 10:42:13 7
generate 30 x 30 matrix

or od /dev/urandom -w60 -An|sed 's/ ..../ /g'|head -n 30 (this one lacks digits 8 and 9)
This is sample output - yours may be different.
6

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

knoppix5 · 2013-02-16 12:56:24 5
Print with tabular
This is sample output - yours may be different.
6

head -4 /etc/passwd | tr : , | sed -e 's/^/| /' -e 's/,/,| /g' -e 's/$/,|/' | column -t -s,

wuseman1 · 2022-04-22 03:03:15 1241
rapidshare download script in 200 characters
This is sample output - yours may be different.
5

u=`curl -d 'dl.start=Free' $(curl $1|perl -wpi -e 's/^.*"(http:\/\/rs.*)" method.*$/$1/'|egrep '^http'|head -n1)|grep "Level(3) \#2"|perl -wpi -e 's/^.*(http:\/\/rs[^\\\\]*).*$/$1/'`;sleep 60;wget $u

fel1x · 2009-04-01 20:14:41 6
get the top 10 longest filenames
This is sample output - yours may be different.
5

find | sed -e "s/^.*\///" | awk ' BEGIN { FS=""} { print NF " " $0 } ' | sort -nrf | head -10

nitehawk · 2009-04-13 21:03:07 5
Download entire commandlinefu archive to single file

'jot' does not come with most *nix distros, so we need to use seq to make it work. This version tested good on Fedora 11.
This is sample output - yours may be different.
5

for x in `seq 0 25 $(curl "http://www.commandlinefu.com/commands/browse"|grep "Terminal - All commands" |perl -pe 's/.+(\d+),(\d+).+/$1$2/'|head -n1)`; do curl "http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/$x" ; done > a.txt

SuperFly · 2009-08-27 11:02:53 7
lotto generator

note the xargs at the end
This is sample output - yours may be different.
5

shuf -i 1-49 | head -n6 | sort -n| xargs

ioggstream · 2009-10-22 12:54:08 93

Plot frequency distribution of words from files on a terminal.

Uses the dumb terminal option in gnuplot to plot a graph of frequencies. In this case, we are looking at a frequency analysis of words in all of the .c files. Show Sample Output

This is sample output - yours may be different.

$ cat *.c | { printf "se te du\nplot '-' t '' w dots\n"; tr '[[:upper:]]' '[[:lower:]]' | tr -s [[:punct:][:space:]] '\n' | sort | uniq -c | sort -nr | head -n 100 | awk '{print $1}END{print "e"}'; } | gnuplot

  60 .+-----+------+------+------+-------+------+------+------+------+-----++
     +      +      +      +      +       +      +      +      +      +      +
     |                                                                      |
  50 ++                                                                    ++
     |                                                                      |
     |.                                                                     |
     |.                                                                     |
  40 ++                                                                    ++
     |                                                                      |
     | ..                                                                   |
  30 ++                                                                    ++
     |   .                                                                  |
     |                                                                      |
  20 ++  ..                                                                ++
     |     ..                                                               |
     |       ..                                                             |
     |         ...                                                          |
  10 ++           ....                                                     ++
     |                ...............                                       |
     +      +      +      +      +   .......................................+
   0 ++-----+------+------+------+-------+------+------+------+------+-----++
     0      10     20     30     40      50     60     70     80     90    100

cat *.c | { printf "se te du\nplot '-' t '' w dots\n"; tr '[[:upper:]]' '[[:lower:]]' | tr -s [[:punct:][:space:]] '\n' | sort | uniq -c | sort -nr | head -n 100 | awk '{print $1}END{print "e"}'; } | gnuplot

taliver · 2009-11-20 14:53:26 8

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 Show Sample Output
This is sample output - yours may be different.
```
> brainwallet_exponent "correct horse battery staple"
> c4bbcb1fbec99d65bf59d85c8cb62ee2db963f0fe106f483d9afa73bd4e39a8a

> echo -ne "correct horse battery staple" | sha256sum
> c4bbcb1fbec99d65bf59d85c8cb62ee2db963f0fe106f483d9afa73bd4e39a8a  -
```
5

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

nixnax · 2014-02-18 01:49:09 29
draw honeycomb

Fill the entire terminal screen. Is COLUMNS or LINES are undefined run "resize"
This is sample output - yours may be different.
5

yes "\\__/ " | tr "\n" " " | fold -$((($COLUMNS-3)/6*6+3)) | head -$LINES

tomhol · 2018-11-23 08:21:55 430
Generate diff of first 500 lines of two files

Useful for massive files where doing a full diff would take too long. This just runs diff on the first 500 lines of each. The use of subshells to feed STDIN is quite a useful construct.
This is sample output - yours may be different.
4

diff <(head -500 product-feed.xml) <(head -500 product-feed.xml.old)

root · 2009-02-11 09:24:38 8
set desktop background to highest-rated image from Reddit /r/wallpapers

You'll need "feh" to set the background from the commandline. Install with "apt-get install feh" Thanks to the Redditors on this thread: http://www.reddit.com/r/linux/comments/bira4/is_there_a_linux_version_of_this_preferably_a/
This is sample output - yours may be different.
4

curl http://www.reddit.com/r/wallpapers.rss | grep -Eo 'http:[^&]+jpg' | head -1 | xargs feh --bg-seamless

shavenwarthog · 2010-03-27 00:08:40 6
let the cow suggest some commit messages for you
This is sample output - yours may be different.
4

while true; do lynx --dump http://whatthecommit.com/ | head -n 1 | cowsay; sleep 2; done

linuxswords · 2011-01-27 14:36:12 10
generate random password (works on Mac OS X)

Prepending env LC_CTYPE=C fixes a problem with bad bytes in /dev/urandom on Mac OS X
This is sample output - yours may be different.
4

env LC_CTYPE=C tr -dc "a-zA-Z0-9-_\$\?" < /dev/urandom | head -c 10

aerickson · 2011-02-22 17:09:44 8
Find the 10 users that take up the most disk space
This is sample output - yours may be different.
4

du -sm /home/* | sort -nr | head -n 10

dan · 2012-09-11 13:09:22 5

Find top 10 largest files in /var directory (subdirectories and hidden files included )

Same as above, but modified to show human readable output Show Sample Output

tree -ihafF /var | tr '[]' ' '| sort -k1hr|head -10

nv21 · 2019-04-23 22:52:45 37

Get the IP address of a machine. Just the IP, no junk.
This is sample output - yours may be different.
3

/sbin/ifconfig -a | awk '/(cast)/ { print $2 }' | cut -d':' -f2 | head -1

d4n3sh · 2009-04-15 06:44:18 12
Add 10 random unrated songs to xmms2 playlist

If you're like me and want to keep all your music rated, and you use xmms2, you might like this command. I takes 10 random songs from your xmms2 library that don't have any rating, and adds them to your current playlist. You can then rate them in another xmms2 client that supports rating (I like kuechenstation). I'm pretty sure there's a better way to do the grep ... | sed ... part, probably with awk, but I don't know awk, so I'd welcome any suggestions. Show Sample Output
This is sample output - yours may be different.
```
Added medialib id 5076 to playlist
Added medialib id 1537 to playlist
Added medialib id 1148 to playlist
Added medialib id 5336 to playlist
Added medialib id 3876 to playlist
Added medialib id 5165 to playlist
Added medialib id 5485 to playlist
Added medialib id 3884 to playlist
Added medialib id 498 to playlist
Added medialib id 3791 to playlist
```
3

xmms2 mlib search NOT +rating | grep -r '^[0-9]' | sed -r 's/^([0-9]+).*/\1/' | sort -R | head | xargs -L 1 xmms2 addid

goodevilgenius · 2009-04-16 20:27:30 6
Generate random password

Generates password consisting of alphanumeric characters, defaults to 16 characters unless argument given. Show Sample Output
This is sample output - yours may be different.
```
frozenfire@sine:~$ randpw 10
9qDVnEYNGx
frozenfire@sine:~$ randpw
6PkWNDsFVTiuKmpX
```
3

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

frozenfire · 2009-08-07 07:30:57 7
< 1 2 3 4 > 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

sudo for launching gui apps in background

Need package: gksu Note: Launching gui app in background that needs sudo, won't work great with our old friendly style of launching: $ sudo gedit /etc/passwd & because this would put sudo in background ! Using gksudo as demonstrated, would popup a gui sudo window. May be this is a common knowledge, but not knowing this frustrated me during my newbie year.

Check if your desired password is already available in haveibeenpwnd database. This command uses the API provided by HIBP

Recursively search and replace old with new string, inside every instance of filename.ext

This is a slightly modified version of http://www.commandlinefu.com/commands/view/4283/recursive-search-and-replace-old-with-new-string-inside-files (which did not work due to incorrect syntax) with the added option to sed inside only files named filename.ext

Create a file of repeated, non-zero

dd can be used with /dev/zero to easily create a file of all zero-bytes. Pipe that through tr and use octal conversions to change the byte values from zero to 0xff (octal 0377). You can replace 0377 with the byte of your choice. You can also use \\0 and \\377 instead of the quoted version.

export iPad App list to txt file

This will generate the same output without changing the current directory, and filepath will be relative to the current directory. Note: it will (still) fail if your iTunes library is in a non-standard location.

Show sections of a man page.

Uses the formatting of a man page to show an outline of its headers and sub-headers.

Deleting / Ignoring lines from the top of a file

Output lines starting at line 2.

Get MD5 checksum from a pipe stream and do not alter it

Display unique values of a column

the column number is '6'

Put split files back together, without a for loop

After splitting a file, put them all back together a lot faster then doing $cat file1 file2 file3 file4 file5 > mainfile or $for i in {0..5}; do cat file$i > mainfile; done When splitting, be sure to do split -d for getting numbers instead of letters

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