Commands using hexdump sorted by votes

Commands using hexdump (21)

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pretend to be busy in office to enjoy a cup of coffee

just make some data scrolling off the terminal. wow.
This is sample output - yours may be different.
47

cat /dev/urandom | hexdump -C | grep "ca fe"

BOYPT · 2010-09-27 08:20:44 22
pretend to be busy in office to enjoy a cup of coffee

Not as taxing on the CPU.
This is sample output - yours may be different.
10

while [ true ]; do head -n 100 /dev/urandom; sleep .1; done | hexdump -C | grep "ca fe"

campassi · 2010-10-05 16:23:31 5
generate 30 x 30 matrix

or od /dev/urandom -w60 -An|sed 's/ ..../ /g'|head -n 30 (this one lacks digits 8 and 9)
This is sample output - yours may be different.
6

hexdump -v -e '"%u"' </dev/urandom|fold -60|head -n 30|sed 's/$.\{2\}$/\1 /g'

knoppix5 · 2013-02-16 12:56:24 4
pretend to be busy in office to enjoy a cup of coffee
This is sample output - yours may be different.
5

export GREP_COLOR='1;32'; cat /dev/urandom | hexdump -C | grep --color=auto "ca fe"

zzambia · 2010-10-04 18:08:11 4
view the system memory in clear text

see what's in your memory right now... sometimes you find passwords, account numbers and url's that were recently used. Anyone have a safe command to clear the memory without rebooting?
This is sample output - yours may be different.
4

hexdump -e '90/1 "%_p" "\n"' /dev/mem | less

copremesis · 2009-05-12 16:20:57 11
Hear the mice moving

Beeps on mouse's every move. Bear in mind that, at least on Ubuntu, /dev/input/mice can be read only by root.
This is sample output - yours may be different.
4

while true; do beep -l66 -f`head -c2 /dev/input/mice|hexdump -d|awk 'NR==1{print $2%10000}'`; done

5z474n · 2009-07-11 12:01:27 22

Dump a web page

Useful to browse dangerous web sites. Show Sample Output

curl -s http://google.com | hexdump -C|less

chilicuil · 2010-02-02 18:54:49 4

Generat a Random MAC address

Generate a random MAC address with capital letters
This is sample output - yours may be different.
3

hexdump -n6 -e '/1 ":%02X"' /dev/random|sed s/^://g

rubo77 · 2015-01-19 03:09:43 9
Functions to display, save and restore $IFS

You can display, save and restore the value of $IFS using conventional Bash commands, but these functions, which you can add to your ~/.bashrc file make it really easy. To display $IFS use the function ifs shown above. In the sample output, you can see that it displays the characters and their hexadecimal equivalent. This function saves it in a variable called $saveIFS: sifs () { saveIFS=$IFS; } Use this function to restore it rifs () { IFS=$saveIFS; } Add this line in your ~/.bashrc file to save a readonly copy of $IFS: declare -r roIFS=$IFS Use this function to restore that one to $IFS rrifs () { IFS=$roIFS; } Show Sample Output
This is sample output - yours may be different.
```
' '     '\t'    '\n'
0x20    0x09    0x0a
```
2

ifs () { echo -n "${IFS}"|hexdump -e '"" 10/1 "'\''%_c'\''\t" "\n"' -e '"" 10/1 "0x%02x\t" "\n\n"'|sed "s/''\|\t0x[^0-9]//g; $,/^$/d"

dennisw · 2009-10-10 22:41:35 8
Extract the MBR ID of a device

Useful when you want to know the mbrid of a device - for the purpose of making it bootable. Certain hybridiso distros, for eg the OpenSUSE live ISO uses the mbrid to find the live media. Use this command to find out the mbrid of your USB drive and then edit the /grub/mbrid file to match it. Show Sample Output
This is sample output - yours may be different.
```
0x8de54e0a
```
2

dd if=/dev/sda bs=1 count=4 skip=$((0x1b8)) 2>/dev/null | hexdump -n4 -e '"0x%x\n"'

d3Xt3r · 2011-07-30 02:42:32 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
shell equivalent of a boss button

Nobody wants the boss to notice when you're slacking off. This will fill your shell with random data, parts of it highlighted. Note that 'highlight' is the Perl module App::highlight, not "a universal sourcecode to formatted text converter." You'll also need Term::ANSIColor. Show Sample Output
This is sample output - yours may be different.
```
mike@charron:~$ boss
00000000  54 50 35 84 2f cf 99 ea  3b e1 60 eb 08 f1 54 35  |TP5./...;.`...T5|
00000010  78 86 70 26 9e 24 f8 92  10 da 08 3c 63 10 49 32  |x.p&.$.....<c.I2|
00000020  40 e7 6d 2b e1 ef 6e ad  bf eb 4c 55 aa 41 f8 2e  |@.m+..n...LU.A..|
00000030  d3 2c ef 83 a7 85 de 3b  88 cd ff 7d f7 42 31 ed  |.,.....;...}.B1.|
00000040  77 be 21 4f a0 5a bd e7  a1 4e d6 73 2d 74 b0 be  |w.!O.Z...N.s-t..|
00000050  75 c6 6f 6e 38 ac 54 69  6f 00 51 95 ae 7d 13 d3  |u.on8.Tio.Q..}..|
00000060  d9 a4 2c 81 8a 07 38 55  b3 45 e3 62 97 2e 86 ca  |..,...8U.E.b....|
```
1

cat /dev/urandom | hexdump -C | highlight ca fe 3d 42 e1 b3 ae f8 | perl -MTime::HiRes -pne "Time::HiRes::usleep(rand()*1000000)"

doherty · 2010-12-29 21:26:18 6
convert binary data to shellcode
This is sample output - yours may be different.
1

hexdump -v -e '"\\""x" 1/1 "%02x" ""' <bin_file>

damncool · 2010-12-31 15:23:07 3

print first n characters of any file in human readble form using hexdump

Usefull to determine unknown file type Show Sample Output

hexdump -C -n 20 filename

aminehmida · 2012-03-05 15:57:41 3

Hexadecimal dump of a file, pipe, or anything
This is sample output - yours may be different.
0

cat testfile | hexdump -C

zed_0xff · 2009-09-07 11:08:43 4
find a particular string on an unmounted partition
This is sample output - yours may be different.
0

hexdump -e '8/1 "%02X ""\t"" "' -e '8/1 "%c""\n"' /dev/sda1 | less /mystring

gerard · 2010-12-17 10:28:40 4
print all characters of any file in human readble form using hexdump

- View non printable characters. - view binary files Show Sample Output
This is sample output - yours may be different.
```
0000000   B   E   G   I   N   :   V   C   A   R   D  \r  \n   V   E   R
0000010   S   I   O   N   :   2   .   1  \r  \n   N   ;   C   H   A   R
0000020   S   E   T   =   U   T   F   -   8   ;   E   N   C   O   D   I
```
0

hexdump -c <file>

totti · 2011-09-09 09:54:16 3
Hex Dump
This is sample output - yours may be different.
0

hexdump -C file

qistoph · 2013-05-07 20:40:02 13
Convert ascii string to hex

hexdump could be used for conversion too!
This is sample output - yours may be different.
0

echo -n text | hexdump -C

Tomofumi · 2014-02-21 09:15:15 7
Generat a Random MAC address

minor improvement, added newline at no cost. Show Sample Output
This is sample output - yours may be different.
```
33:05:DA:B0:DE:80
```
0

hexdump -n6 -e '/1 "%02X:"' /dev/random|sed 's/:$/\n/'

colavi · 2015-02-05 13:14:07 8
Hex Dump
This is sample output - yours may be different.
-4

cat /dev/ttyS2 | hexdump -C

techie · 2013-05-07 14:54:37 11

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list files recursively by size

Parse m3u playlist file for total time

Parse an m3u file with seconds for each item and output the length of the entire playlist

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"

run complex remote shell cmds over ssh, without escaping quotes

It executes commands as arguments to ssh, avoiding problematic shell expansions, without the need of writing the commands in question to a temporary file, just reading them from STDIN.

Count the number of pages of all PDFs in current directory and all subdirs, recursively

Displays process tree of all running processes

G - uses VT100 line drawing a - shows command line arguments of process p - prints PID of process For other options, man pstree :)

Find the package that installed a command

phpinfo from the command line

php -i seems to show default not real

The simplest way to transport information over a network

Einstein's razor: As simple as possible, but not simpler. On the destination machine netcat listens on any port (1234 in the example) and sends anything it receives into a file or pipe. On the source machine a separate netcat takes input from a file or pipe and sends it over the network to the listener. This is great between machines on a LAN where you don't care about authentication, encryption, or compression and I would recommend it for being simpler than anything else in this situation. Over the internet you should use something with better security.

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"

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Commands using hexdump (21)

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