Commands tagged xxd sorted by votes

Commands tagged xxd (6)

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Generate a Random MAC address

Use the following variation for FreeBSD: openssl rand 6 | xxd -p | sed 's/$..$/\1:/g; s/:$//'
This is sample output - yours may be different.
16

openssl rand -hex 6 | sed 's/$..$/\1:/g; s/.$//'

putnamhill · 2010-09-23 02:31:12 3
Binary injection

Replace (as opposed to insert) hex opcodes, data, breakpoints, etc. without opening a hex editor. HEXBYTES contains the hex you want to inject in ascii form (e.g. 31c0) OFFSET is the hex offset (e.g. 49cf) into the binary FILE
This is sample output - yours may be different.
2

echo -n $HEXBYTES | xxd -r -p | dd of=$FILE seek=$((0x$OFFSET)) bs=1 conv=notrunc

zombiedeity · 2009-03-11 17:02:24 271
Binary search/replace

Replace all instances of "A" with "B" in file "source" saved as file "destination". !! IF A/B is multi-byte, then separate bytes with spaces like so: "s/20\ 0A/00/g". Show Sample Output
This is sample output - yours may be different.
```
 
```
2

xxd -p source | fold -w2 | paste -sd' ' | sed "s/A/B/g" | xxd -p -r > destination

hincor · 2015-05-26 18:29:48 10
use xxd to create the wake on lan magicpacket and write to pcap file

just set macdst to the mac address of the system you wish to wake up, the macsrc is optional but helps use tcpreplay to broadcast or wireshark to view
This is sample output - yours may be different.
1

macdst="5873b856445f";macsrc="d2a791e1715a";pkt="d4c3b2a1020004000000000000000000ffff000001000000e3eab353fa1f 0b007400000074000000$macdst $macsrc 0842ffffffffffff";for i in {1..16}; do pkt="$pkt $macdst"; done; echo "$pkt" | xxd -r -p > magicpacket.pcap

unixmonkey77095 · 2014-07-02 17:37:44 4
print all characters of a file using hexdump

xxd can convert a hexdump back to binary using the -r option which can be useful for patching or editing binary files.
This is sample output - yours may be different.
0

xxd <file>

putnamhill · 2011-09-09 21:52:30 2
Function to check whether a regular file ends with a newline

end_w_nl filename will check if the last byte of filename is a unix newline character. tail -c1 yields the file's last byte and xxd converts it to hex format.
This is sample output - yours may be different.
0

end_w_nl() { [[ $(tail -c1 $1 | xxd -ps) == 0a ]] }

xro · 2012-09-18 20:11:29 2

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disassemble binary shellcode

The options -b binary and -m are needed for disassembling raw machine code when it is not part of a full binary executable with proper headers.

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Delete all non-printing characters from a file

tr has some predefined sets of characters that are more convenient to use than characters codes

cat ~/.ssh/id_rsa.pub | ssh user@site.com "cat - >> ~/.ssh/authorized_keys"

You'll want to use this for passwordless logins. Same as ssh-copy-id, if you don't have it on your system.

Install pip with Proxy

Installs pip packages defining a proxy

Quick network status of machine

credit to tumblr engineering blog @ http://engineering.tumblr.com/

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.

Pretty print SQL query with python in one line

You need to apt-get install python-sqlparse. This command simply formats a sql query and prints it out. It is very useful when you want to move a sql query from commandline to a shell script. Everything is done locally, so you don't need to worry about copying sql query to external websites.

Check if *hardware* is 32bit or 64bit

This command tell you if your hardware is 32 or 64 bits even if you install a 32bits OS on a 64 bits hardware. If your distro don't support the -q switch, try doing : $ grep &>/dev/null '\' /proc/cpuinfo && echo 64 bits || echo 32 bits

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Commands tagged xxd (6)

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