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 22:52:55 180

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 16:15:51 226
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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Download entire website for offline viewing

?mirror : turn on options suitable for mirroring. -p : download all files that are necessary to properly display a given HTML page. ?convert-links : after the download, convert the links in document for local viewing. -P ./LOCAL-DIR : save all the files and directories to the specified directory.

Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

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

convert pdf to graphic file format (jpg , png , tiff ... )

need imagemagick package

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" }

move you up one directory quickly

In bash, this turns on auto cd. If a command is just a directory name, it cd's into that directory.

Get all upgradable deb packages in a single line

Works for debian and ubuntu based distros.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Copy an element from the previous command

You can specify a range via '-'.

macOS: Save disk space by moving apps to external drives

Because Mac app bundles contain everything in one place, it makes running them from anywhere, including from a device such as a USB flash drive or external HDD, possible. So if your Mac has a mere 256GB of storage (as mine does), you can free up large quantities of disk space by storing apps like, say, Xcode on external devices.

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Commands using head (314)

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