Commands using head sorted by votes

Commands using head (314)

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Top 10 requestors by IP address from Apache/NCSA Logs
This is sample output - yours may be different.
3

awk '{print $1}' /var/log/httpd/access_log | sort | uniq -c | sort -rnk1 | head -n 10

flip387 · 2009-08-30 15:32:26 3
Produce a pseudo random password with given length in base 64
This is sample output - yours may be different.
3

date +%s | sha256sum | base64 | head -c <length>; echo

markdrago · 2010-04-30 22:05:11 7
Check apache config syntax and restart or edit the file

Checks the apache configuration syntax, if is OK then restart the service otherwise opens the configuration file with VIM on the line where the configuration fails.
This is sample output - yours may be different.
3

( apache2ctl -t && service apache2 restart || (l=$(apache2ctl -t 2>&1|head -n1|sed 's/.*line\s$[0-9]*$.*/\1/'); vim +$l $(locate apache2.conf | head -n1)))

cicatriz · 2010-11-26 18:12:08 78
find an unused unprivileged TCP port

perl-less way
This is sample output - yours may be different.
3

(netstat -atn | awk '{printf "%s\n%s\n", $4, $4}' | grep -oE '[0-9]*$'; seq 32768 61000) | sort -n | uniq -u | head -n 1

depesz · 2010-12-15 09:27:59 3
Provide the ten largest subfolders in the current folder
This is sample output - yours may be different.
3

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

mirams · 2014-04-14 17:54:23 11

Sort processes by CPU Usage

Short list about top 10 processes, sorted by CPU usage Show Sample Output

ps aux | sort -rk 3,3 | head -n 10

x3mboy · 2018-10-29 20:00:36 563

Sort processes by CPU Usage
This is sample output - yours may be different.
3

ps auxk -%cpu | head -n10

rolanda · 2019-06-29 19:17:14 46

Top 10 Memory Processes

It displays the top 10 processes sorted by memory usage Show Sample Output

ps aux | sort -rk 4,4 | head -n 10

x3mboy · 2019-09-26 16:37:33 90

See the top 10 IP addresses in a web access log
This is sample output - yours may be different.
2

# cut -d ' ' -f1 /var/log/nginx/nginx-access.log | sort | uniq -c | sort -nr | head -10 | nl

msisk · 2009-02-07 00:22:11 12
Create passwords and store safely with gpg

Adjust the head -c part for password length. I use filenames like "hans@commandlinefu.com.gpg" and a vim which automatically decrypts files with .gpg suffixes.
This is sample output - yours may be different.
2

tr -dc "a-zA-Z0-9-_\$\?" < /dev/urandom | head -c 10 | gpg -e -r medha@nerdish.de > password.gpg

hans · 2009-02-25 08:48:26 7
Print the last modified file
This is sample output - yours may be different.
2

ls -t1 | head -n1

neW1 · 2009-02-26 09:12:36 9
Display 6 largest installed RPMs sorted by size (descending)

Low on disk space? Check the largest installed RPMs for delete canditates. Show Sample Output
This is sample output - yours may be different.
```
$ rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs
     1	783535706 ibm-notes-editors
     2	396131310 ibm-notes-notesplugin
     3	354961772 clipart-openclipart
     4	238607804 ibm-notes-framework
     5	136072442 openoffice.org-core
     6	117823438 libboost-devel
```
2

rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs

mpb · 2009-03-15 22:18:17 9
copies 20 most recently downloaded mp3 files (such as from Miro) into a directory

Change ~/tmp to the destination directory, such as your mounted media. Change -n20 to whatever number of files to copy. It should quit when media is full. I use this to put my most recently downloaded podcasts onto my phone.
This is sample output - yours may be different.
2

find . -name \*.mp3 -printf "%C+ %h/%f\n" | sort -r | head -n20 | awk '{print "\""$2"\""}' | xargs -I {} cp {} ~/tmp

bkinsey · 2009-05-17 07:06:10 4
Pick a random line from a file
This is sample output - yours may be different.
2

sort -R file.txt | head -1

dfego · 2009-07-23 22:24:52 12
Get table column names from an MySQL-database in comma-seperated form
This is sample output - yours may be different.
2

mysql -u<user> -p<password> -s -e 'DESCRIBE <table>' <database> | tail -n +1 | awk '{ printf($1",")}' | head -c -1

Cowboy · 2009-08-17 12:54:44 3
Print a list of the 30 last modified mp3s sorted by last first
This is sample output - yours may be different.
2

find ~/Music -daystart -mtime -60 -name *mp3 -printf "%T@\t%p\n" | sort -f -r | head -n 30 | cut -f 2

iadbungler · 2009-10-06 17:57:04 3
Outputs a 10-digit random number
This is sample output - yours may be different.
2

head -c4 /dev/urandom | od -N4 -tu4 | sed -ne '1s/.* //p'

opexxx · 2009-10-08 11:27:20 4
Outputs a 10-digit random number
This is sample output - yours may be different.
2

tr -c -d 0-9 < /dev/urandom | head -c 10

hfs · 2009-10-09 11:58:30 3
Blue Matrix

Same as original, but works in bash
This is sample output - yours may be different.
2

while [ 1 -lt 2 ]; do i=0; COL=$((RANDOM%$(tput cols)));ROW=$((RANDOM%$(tput cols)));while [ $i -lt $COL ]; do tput cup $i $ROW;echo -e "\033[1;34m" $(cat /dev/urandom | head -1 | cut -c1-1) 2>/dev/null ; i=$(expr $i + 1); done; done

dave1010 · 2010-05-28 16:07:56 5
Generat a Random MAC address

Just increase the 1 at the end if you want to generate more than one. (Alternative to "| head -n N" you could use the -b flag of od: -b $[6*N] Show Sample Output
This is sample output - yours may be different.
```
ca:41:5d:28:ad:a2
```
2

od /dev/urandom -w6 -tx1 -An|sed -e 's/ //' -e 's/ /:/g'|head -n 1

karel1980 · 2011-05-16 15:05:34 5
cd into the latest directory
This is sample output - yours may be different.
2

alias cd1='cd $( ls -lt | grep ^d | head -1 | cut -b 51- )'

soulonfire · 2011-06-22 11:45:15 12
List top 10 files in filesystem or mount point bigger than 200MB

Specify the size in bytes using the 'c' option for the -size flag. The + sign reads as "bigger than". Then execute du on the list; sort in reverse mode and show the first 10 occurrences. Show Sample Output
This is sample output - yours may be different.
```
675.07  /myfs/sop/infranc/med/20110201/det_med_MOS.txt
393.57  /myfs/sop/inffin/part/20110407/fact_par_201103.accdb
338.03  /myfs/20110501/det_med_MOS.txt
338.02  /myfs/AC/SGE/20110501/EVID.txt
338.00  /myfs/infranc/med/20110601/det_med_EOV.txt
337.96  /myfs/AC/SGE/20110601/EVID.txt
```
2

find /myfs -size +209715200c -exec du -m {} \; |sort -nr |head -10

arlequin · 2011-07-07 21:12:46 3
pretend to be busy in office to enjoy a cup of coffee

combination of several of the above
This is sample output - yours may be different.
2

export GREP_COLOR='1;32';while [ true ]; do head -n 100 /dev/urandom; sleep .1; done | hexdump -C | grep --color=auto "ca fe"

tbaschak · 2012-02-14 19:30:03 3

list the top 15 folders by decreasing size in MB

list the top 15 folders by decreasing size in MB Show Sample Output

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

bouktin · 2013-05-23 10:45:21 6

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
This is sample output - yours may be different.
2

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

yakovlev · 2014-02-05 15:04:07 6
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Generate Random Text based on Length

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

computes the most frequent used words of a text file

Create a tar archive with all files of a certain type found in present dir and subdirs

Note: the tar archive must not exist in order to create it. If exists it will only be updated and no already existent files in present search will still remain in the tar archive. The update option has to be used instead of create because the command tar may be executed more than once depending on the number of arguments that find throws. You can see maximum number of arguments with 'getconf ARG_MAX'

Cryptographically secure 32-bit RNG in strict ZSH

ZSH ships a couple random number generators via the $RANDOM environment variable and rand48() via zsh/mathfunc, but neither are cryptographically secure. This code produces a 32-bit random number suitable for cryptography. It's only dependency is /dev/urandom and it does not rely on any shell commands or 3rd party utilities. It assumes ZSH was compiled with 64-bit integer support.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Rename files in batch

List by size all of the directories in a given tree.

a function to create a box of '=' characters around a given string.

First argument: string to put a box around. Second argument: character to use for box (default is '=') Same as command #4962, cleaned up, shortened, and more efficient. Now a ' * ' can be used as the box character, and the variables get unset so they don't mess with anything else you might have. They marked c++ as a function for this command, but I'm not sure why. Must be a bug.

Create a single-use TCP proxy with debug output to stderr

or you can add "-x" to get a typical hexdump like output

Mirror every lvol in vg00 in hp-ux 11.31

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Commands using head (314)

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