CODEWITHSUNDEEP
greppcre
just in
just in

Reputation: 23

Grep search for binary data

Why does this command work

echo -ne "\x74\x79\xf4"|grep -aPo "\x74\x79"

and this doesn't?

echo -ne "\x74\x79\xf4"|grep -aPo "\x74\x79\xf4"

Upvotes: 2

Views: 170

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626758

The following will work:

echo -ne "\x74\x79\xC3\xB4" | grep -aPo "\x74\x79\xf4"
#                  ^^^^^^^
echo -ne "\x74\x79\u00F4" | grep -aPo "\x74\x79\xf4"
#                 ^^^^^^

The \xF4 is not a single byte, it consists of two bytes, C3 and B4. Thus, to encode it properly in the echo command, you need to use \xC3\xB4 sequence.

With \u00F4, you specify the code unit.

Upvotes: 2

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