Commands using head sorted by votes

Commands using head (314)

sorted by

Generate a random password 30 characters long

This command is similar to the alternate, except with head(1), you can pick as many passwords as you wish to generate by changing the number of lines you wish to preview. Show Sample Output
This is sample output - yours may be different.
```
LNukKQoRym5TGKfr1FkkIKX03TcnaV
```
2

strings /dev/urandom | tr -cd '[:alnum:]' | fold -w 30 | head -n 1

atoponce · 2014-12-11 06:21:51 9
Calculate files' size
This is sample output - yours may be different.
2

ls -l | head -n 65535 | awk '{if (NR > 1) total += $5} END {print total/(1024*1024*1024)}'

zluyuer · 2014-12-16 04:09:44 11
Top 10 Memory Consuming Processes
This is sample output - yours may be different.
2

ps -auxf | sort -nr -k 4 | head -10

ajoshi83 · 2015-06-19 10:16:09 12
command shell generate random strong password

shell generate random strong password Show Sample Output
This is sample output - yours may be different.
```
NXuc2VjRcOhW7zyQDBhH
```
2

len=20; tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${len} | xargs

aysadk · 2019-04-16 20:20:46 38

Top 10 Memory Processes (reduced output to applications and %usage only)

Top 10 Memory Processes (reduced output to applications and %usage only) Show Sample Output

ps aux | sort -rk 4,4 | head -n 10 | awk '{print $4,$11}'

n0a110w · 2019-10-20 22:52:55 180

Superfast portscanner
This is sample output - yours may be different.
2

time seq 65535 | parallel -k --joblog portscan -j9 --pipe --cat -j200% -n9000 --tagstring '\033[30;3{=$_=++$::color%8=}m' 'nc -vz localhost $(head -n1 {})-$(tail -n1 {})'

wuseman1 · 2021-09-14 16:15:51 228
Ride another SSH agent

Must be done as root - will cause subsequent ssh connections to use the identities available via the [user]'s agent socket. Show Sample Output
This is sample output - yours may be different.
```
# export SSH_AUTH_SOCK=`find /tmp/ssh* -type s -user joeuser -mtime -1 | head -1`
linux:/tmp/ssh-WjKuI4788 # ssh-add -l
2048 00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF /home/joeuser/.ssh/id_rsa (RSA)
# ssh joeuser@remote
...
joeuser@remote>
```
1

export SSH_AUTH_SOCK=`find /tmp/ssh* -type s -user [user] -mtime -1 | head -1`

wwest4 · 2009-02-05 20:55:41 15
Jump to a song in your XMMS2 playlist, based on song title/artist

Usage: Declare this function in your Shell, then use it like this: > jumpTo foo The script will search for the 'foo' pattern in your current xmms2 playlist (artist or songname), and play the first occurence of it !
This is sample output - yours may be different.
1

function jumpTo { xmms2 jump `xmms2 list | grep -i '$1' | head -n 1 | tail -n 1 | sed -re 's@.+\[(.+)/.+\] (.+)@\1@'`; }

pyrho · 2009-04-10 13:43:57 12
Find and delete oldest file of specific types in directory tree

This works on my ubuntu/debian machines. I suspect other distros need some tweaking of sort and cut. I am sure someone could provide a shorter/faster version.
This is sample output - yours may be different.
1

find / $ -name "*.log" -o -name "*.mylogs" $ -exec ls -lrt {} \; | sort -k6,8 | head -n1 | cut -d" " -f8- | tr -d '\n' | xargs -0 rm

ghazz · 2009-05-10 10:45:48 8
Extract the emoticons regex from a running skype process

Skype has an internal regex which depicts the emoticons it supports. However you cannot simply search the binary file for it. This small 181 character line will do just that, provided skype is running. And of course, only works in linux. Show Sample Output
This is sample output - yours may be different.
```
(...) |$banghead$|$bear$|$beer$|$blush$|$bow$|$bricklayers$|$brokenheart$|$bug$|$bye$|$cake$|$call$|$cash$|$chuckle$| (...)
```
1

S=`pidof skype`;grep heap /proc/$S/maps|cut -f1 -d' '|awk -F- '{print "0x" $1 " 0x" $2}'|xargs echo "du me t ">l;gdb -batch -p $S -x l>/dev/null 2>&1;strings t|grep \(smirk|head -n1

alvieboy · 2009-06-26 20:03:17 6
Display top 5 processes consuming CPU
This is sample output - yours may be different.
1

ps -eo pcpu,user,pid,cmd | sort -r | head -5

ferqwerty · 2009-11-03 14:41:55 4
A function to find the newest file in a directory

Works recusivley in the specified dir or '.' if none given. Repeatedly calls 'find' to find a newer file, when no newer files exist you have the newest. In this case 'newest' means most recently modified. To find the most recently created change -newer to -cnewer. Show Sample Output
This is sample output - yours may be different.
```
[user@localhost ~]$ newest /var/www/html/
/var/www/html/manual/createCustomColumn.png
[user@localhost ~]$
```
1

newest () { DIR=${1:-'.'}; CANDIDATE=`find $DIR -type f|head -n1`; while [[ ! -z $CANDIDATE ]]; do BEST=$CANDIDATE; CANDIDATE=`find $DIR -newer "$BEST" -type f|head -n1`; done; echo "$BEST"; }

shadycraig · 2010-02-04 12:40:44 5
most used unix commands
This is sample output - yours may be different.
1

cut -d\ -f 1 ~/.bash_history | sort | uniq -c | sort -rn | head -n 10 | sed 's/.*/ &/g'

er0k · 2010-04-06 22:48:26 6
Display a random man page

I'm not sure why you would want to do this, but this seems a lot simpler (easier to understand) than the version someone submitted using awk.
This is sample output - yours may be different.
1

man $(ls /bin | shuf | head -1)

goodevilgenius · 2010-08-20 23:12:51 4
Download and install the newest dropbox beta
This is sample output - yours may be different.
1

wget http://forums.dropbox.com && wget $(cat index.html|grep "Latest Forum Build"|cut -d"\"" -f2) && wget $(cat topic.php*|grep "Linux x86:"|cut -d"\"" -f2|sort -r|head -n1) && rm -rf ~/.dropbox* && rm index.html *.php* && tar zxvf dropbox-*.tar.gz -C ~/

kjell81d · 2010-08-28 09:23:42 3
Generate a random password 30 characters long
This is sample output - yours may be different.
1

tr -cd '[:alnum:]' < /dev/urandom | fold -w30 | head -n1

putnamhill · 2010-09-28 12:25:58 5
Show CPU usage for EACH cores
This is sample output - yours may be different.
1

ps ax -L -o pid,tid,psr,pcpu,args | sort -nr -k4| head -15 | cut -c 1-90

strzel_a · 2010-11-17 01:04:31 5
create random string from /dev/urandom (or another length)
This is sample output - yours may be different.
1

echo `cat /dev/urandom |tr -dc "[:alnum:]" | head -c64`

unixmonkey14859 · 2010-12-06 20:01:56 8
lotto generator
This is sample output - yours may be different.
1

seq -w 50 | sort -R | head -6 |fmt|tr " " "-"

metalx1000 · 2011-01-05 01:12:58 22
find the biggest file in current folder
This is sample output - yours may be different.
1

ls -S|head -1find

liyuance · 2011-01-15 10:20:31 5
Create a bash script from last n commands

Uses history to get the last n+1 commands (since this command will appear as the most recent), then strips out the line number and this command using sed, and appends the commands to a file.
This is sample output - yours may be different.
1

history | tail -(n+1) | head -(n) | sed 's/^[0-9 ]\{7\}//' >> ~/script.sh

unixmonkey15842 · 2011-06-08 13:40:58 3
Generate a quick, lengthy password
This is sample output - yours may be different.
1

head /dev/urandom | md5sum | base64

kaufmobeel · 2011-07-17 14:50:23 3

Displays user-defined ps output and pidstat output about the top CPU or MEMory users.

It grabs the PID's top resource users with $(ps -eo pid,pmem,pcpu| sort -k 3 -r|grep -v PID|head -10) The sort -k is sorting by the third field which would be CPU. Change this to 2 and it will sort accordingly. The rest of the command is just using diff to display the output of 2 commands side-by-side (-y flag) I chose some good ones for ps. pidstat comes with the sysstat package(sar, mpstat, iostat, pidstat) so if you don't have it, you should. I might should take off the timestamp... :| Show Sample Output

This is sample output - yours may be different.

							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	builder    0  19 127652 510608 205612 10.0 Sl
04:47:32 PM      2050    3.70    0.51    0.00    4.21     1   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	root       0  19 15690  62760 38920  1.8 Rs+
04:47:32 PM      1655    0.93    2.40    0.00    3.33     1   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	builder    0  19 46361 185444 41000  1.9 Sl
04:47:32 PM      8461    1.34    0.53    0.00    1.87     0   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	builder    0  19 61604 246416 37580  1.8 Sl
04:47:32 PM      1846    1.67    0.66    0.00    2.33     0   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	root       0  19  5637  22548  7016  0.3 S
04:47:32 PM      2148    1.14    0.39    0.00    1.53     1   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	104        0  19   768   3072  1312  0.0 Ss
04:47:32 PM       801    0.80    0.34    0.00    1.14     0   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	root       0  19  3267  13068  6992  0.3 S
04:47:32 PM      2152    0.70    0.14    0.00    0.84     1   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	builder    -   0 11985  47940 38568  1.8 SNl
04:47:32 PM      2029    0.47    0.03    0.00    0.50     1   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	root       0  19  4665  18660  1120  0.0 Ssl
04:47:32 PM      1143    0.09    0.33    0.00    0.43     0   <
							      |	EUSER     NI PRI    SZ    VSZ   RSS %MEM STAT
04:47:32 PM       PID    %usr %system  %guest    %CPU   CPU   |	root       -  90     0      0     0  0.0 S
04:47:32 PM      2381    0.00    0.14    0.00    0.14     1   <

for i in $(ps -eo pid,pmem,pcpu| sort -k 3 -r|grep -v PID|head -10|awk '{print $1}');do diff -yw <(pidstat -p $i|grep -v Linux) <(ps -o euser,pri,psr,pmem,stat -p $i|tail);done

bob_the_builder · 2012-02-16 20:54:32 23

Top 20 commands in your bash history
This is sample output - yours may be different.
1

sed -e 's/[;|][[:space:]]*/\n/g' .bash_history | cut --delimiter=' ' --fields=1 | sort | uniq --count | sort --numeric-sort --reverse | head --lines=20

WissenForscher · 2012-02-17 23:34:16 5
See OpenVZ Container id's of top 10 running processes by %cpu

This command will list the PID, VEID, and Name of the 10 highest cpu using processes on a openvz host. You must have vzpid installed. Show Sample Output
This is sample output - yours may be different.
```
Pid     VEID    Name
2860    1014040 ruby
5647    0       htop
5143    1013101 mysqld
6095    1013151 mysqld
2922    1014040 ruby
3043    0       ruby
4252    1014045 freshclam
3488    1014045 amavisd-new
1       0       init
9       0       events/0
```
1

ps -e h -o pid --sort -pcpu | head -10 | vzpid -

mrkmg · 2012-05-24 14:16:40 5
‹ First < 2 3 4 5 6 > 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

Install pip with Proxy

Installs pip packages defining a proxy

Speaking alarm clock

This ran on a ubuntu box using espeak for speaking text with the bash shell. On a mac you should use 'say'. Also you can change your alarm interval and your snooze interval which are currently 8 hours and 1 minute. I would run this via cron yet it's easier to disable if you run it as a command like this :P

Optimal way of deleting huge numbers of files

Using xargs is better than: $ find /path/to/dir -type f -exec rm \-f {} \; as the -exec switch uses a separate process for each remove. xargs splits the streamed files into more managable subsets so less processes are required.

gain all mp3s in subfolders w/o encoding

This will search all subfolders for mp3's and gain them to more or less sane defaults (without reencoding). http://mp3gain.sourceforge.net/ required!

Print number of mb of free ram

Use jq to validate and pretty-print json output

The `jq` tool can also be used do validate json files and pretty print output: ` jq < file.json` Available on several platforms, including newer debian-based systems via `#sudo apt install jq`, mac via `brew install jq`, and from source https://stedolan.github.io/jq/download/ This alternative to the original avoids the useless use of cat

Get all links of a website

This will allow you to browse web sites using "-dump" with elinks while you still are logged in

README: This require you to login on facebook with elinks without using '-dump' first time and when you have logged in you will then be able to dump all data from facebook without any advanced combos, dump is all you need for see all your friends newsfeed or whatever you wish to view in cli/terminal. Facebook is just an example, same requirements for all websites that have a login form.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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