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hping2

hex2bin is an utility to convert a string in hexadecimal format like
"2b2b2b415448300d" (an example to test a stupid modem vulnerability)
in the binary equivalent. For example:

# echo -n "2b2b2b415448300d" | ./hex2bin > modem.string

# cat modem.string
+++ATH0

# ls -l modem.string
-rw-r--r--   1 antirez  users           8 Nov 17 16:01 modem.string

# hping2 --file ./modem.string -d 8 --icmp target.host.org

using switch '-r' hex2bin perform exactly the inverse operation.
for example:

echo "antirez" | ./hex2bin -r

616e746972657a0a