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
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strace like SystemTap script

The stap script is : #! /usr/bin/env stap probe syscall.* { if (pid() == target()) printf("%s %s\n", name, argstr); }

Find files with the same names in several directories.

cat file1 file2 file3|sort|uniq -d finds the same lines in several files, especially in files with lists of files.

Forwards connections to your port 2000 to the port 22 of a remote host via ssh tunnel

Resume a detached screen session, resizing to fit the current terminal

By default, screen tries to restore its old window sizes when attaching to resizable terminals. This command is the command-line equivalent to typing ^A F to fit an open screen session to the window.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

a function to find the fastest DNS server

http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Backup (archive) your Gmail IMAP folders.

Copies an entire hierarchy of mailboxes from the named POP3/IMAP/etc. source to the named destination. Mailboxes are created on the destination as needed. NOTE: The 'mailutil' is Washington's University 'mailutil' (apt-get install uw-mailutils). More examples $ mailutil transfer {imap.gmail.com/ssl/user=you@gmail.com}INBOX Gmail/ ; mailutil check imap.gmail.com/ssl/user=you@gmail.com}\[Gmail\]/Spam If you use the utility in the first, append -v|-d flag(s) to the end the commands above (man mailutil).

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

find previously entered commands (requires configuring .inputrc)

[Click the "show sample output" link to see how to use this keystroke.] Meta-p is one of my all time most used and most loved features of working at the command line. It's also one that surprisingly few people know about. To use it with bash (actually in any readline application), you'll need to add a couple lines to your .inputrc then have bash reread the .inputrc using the bind command: $ echo '"\en": history-search-forward' >> ~/.inputrc $ echo '"\ep": history-search-backward' >> ~/.inputrc $ bind -f ~/.inputrc I first learned about this feature in tcsh. When I switched over to bash about fifteen years ago, I had assumed I'd prefer ^R to search in reverse. Intuitively ^R seemed better since you could search for an argument instead of a command. I think that, like using a microkernel for the Hurd, it sounded so obviously right fifteen years ago, but that was only because the older way had benefits we hadn't known about. I think many of you who use the command line as much as I do know that we can just be thinking about what results we want and our fingers will start typing the commands needed. I assume it's some sort of parallel processing going on with the linguistic part of the brain. Unfortunately, that parallelism doesn't seem to work (at least for me) with searching the history. I realize I can save myself typing using the history shortly after my fingers have already started "speaking". But, when I hit ^R in Bash, everything I've already typed gets ignored and I have to stop and think again about what I was doing. It's a small bump in the road but it can be annoying, especially for long-time command line users. Usually M-p is exactly what I need to save myself time and trouble. If you use the command line a lot, please give Meta-p a try. You may be surprised how it frees your brain to process more smoothly in parallel. (Or maybe it won't. Post here and let me know either way. ☺)

Generate a random left-hand password

Generates a random 8-character password that can be typed using only the left hand on a QWERTY keyboard. Useful to avoid taking your hand off of the mouse, especially if your username is left-handed. Change the 8 to your length of choice, add or remove characters from the list based on your preferences or kezboard layout, etc.

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Commands using head (314)

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