Commands using head sorted by votes

Commands using head (314)

sorted by

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 20:00:36 581

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 95

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 13
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 7
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
< 1 2 3 4 5 > 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

run a command whenever a file is touched

This is useful if you'd like to see the output of a script while you edit it. Each time you save the file the command is executed. I thought for sure something like this already exists - and it probably does. I'm on an older system and tend to be missing some useful things. Examples: $ ontouchdo yourscript 'clear; yourscript somefiletoparse' Edit yourscript in a separate window and see new results each time you save. $ ontouchdo crufty.html 'clear; xmllint --noout crufty.html 2>&1 | head' Keep editing krufty.html until the xmllint window is empty. Note: Mac/bsd users should use stat -f%m. If you don't have stat, you can use perl -e '$f=shift; @s=stat($f); print "$s[9]\n";' $1

list files recursively by size

Compare a remote file with a local file

Get the IP of the host your coming from when logged in remotely

Even faster without the need for cut... :)

Run the Firefox Profile Manager

even when another instance is already open. Great for testing purposes when you need to be 2 people at once on the same site.

Switch all connected PulseAudio bluetooth devices to A2DP profile

Tries to switch all audio devices to the A2DP profile for optimal sound quality. Useful for bluetooth speakers and headphones that always power up in HSP/HFP mode. Note however that this command is only a shorthand for the GUI, so it cannot fix stubborn BT controllers that leave your device stuck in HSP mode until a manual re-coupling.

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

List top 20 IP from which TCP connection is in SYN_RECV state

List top 20 IP from which TCP connection is in SYN_RECV state. Useful on web servers to detect a syn flood attack. Replace SYN_ with ESTA to find established connections

convert doc to pdf

convert to pdf and many other formats and vise versa to get a list of supported formats, run $ unoconv --show

apt-get via sudo

An apt-get wrapper function which will run the command via sudo, but will run it normally if you're only downloading source files. This was a bit of an excuse to show off the framework of $ cmd && echo true || echo false ...but as you can see, you must be careful about what is in the "true" block to make sure it executes without error, otherwise the "false" block will be executed. To allow the apt-get return code to pass through, you need to use a more normal if/else block: $ apt-get () { if [ "$1" = source ]; then command apt-get "$@"; else sudo apt-get "$@"; fi }

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