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"
Grep search for binary data
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1 Answers
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.
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