Commands using head sorted by votes

Commands using head (314)

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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 22:52:55 181

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 16:15:51 232
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 ›

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identify NEEDED sonames in a path

This works in combination with http://www.commandlinefu.com/commands/view/10496/identify-exported-sonames-in-a-path as it reports the NEEDED entries present in the files within a given path. You can then compare it with the libraries that are exported to make sure that, when cross-building a firmware image, you're not bringing in dependencies from the build host. The short version of it as can be seen in the same output is $ scanelf -RBnq -F "+n#f" $1 | tr ',' '\n' | sort -u

silent/shh - shorthand to make commands really quiet

Sometimes I just want to run a command quietly but all that keyboard shifting makes my fingers hurt. This little function does the job eg.: $ if shh type less; then PAGER=less; fi

A very simple and useful stopwatch

time read -sn1 (s:silent, n:number of characters. Press any character to stop)

Post a message to another users screen via SSH

Post a message on another users screen via SSH

Terminal Escape Code Zen - Strace and Tput

Depending on the TERM, the terminfo version, ncurses version, etc.. you may be using a varied assortment of terminal escape codes. With this command you can easily find out exactly what is going on.. This is terminal escape zen! $ ( 2>&2 strace -f -F -e write -s 1000 sh -c 'echo -e "initc\nis2\ncnorm\nrmso\nsgr0" | tput -S' 2>&1 ) | grep -o '"\\[^"]*"' --color=always "\33]4;%p1%d;rgb:%p2%{255}%*%{1000}%/%2.2X/%p3%{255}%*%{1000}%/%2.2X/%p4%{255}%*%{1000}%/%2.2X\33\\\33[!p\33[?3;4l\33[4l\33>\33[?12l\33[?25h\33[27m\33(B\33[m" Lets say you want to find out what you need to echo in order to get the text to blink.. $ echo -e "`tput blink`This will blink`tput sgr0` This wont" Now you can use this function instead of calling tput (tput is much smarter for portable code because it works differently depending on the current TERM, and tput -T anyterm works too.) to turn that echo into a much faster executing code. tput queries files, opens files, etc.. but echo is very strait and narrow. So now you can do this: $ echo -e "\33[5mThis will blink\33(B\33[m This wont" More at http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

Exclude inserting a table from a sql import

Starting with a large MySQL dump file (*.sql) remove any lines that have inserts for the specified table. Sometimes one or two tables are very large and uneeded, eg. log tables. To exclude multiple tables you can get fancy with sed, or just run the command again on subsequently generated files.

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"

sed edit-in-place using -a option instead of -i option (no tmp file created)

does the -i option open a tmp file? this method does not.

Convert multiple files using avidemux

Using avidemux to convert multiple files that are in the folder where the command was executed.

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

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Commands using head (314)

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