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dd, but without understanding exactly what chunk you want to extract I'm limiting to making this a comment rather than an answer.fafafafad0starts at character 195 of the hex dump, meaning it's byte 98 of the binary file, butfafafafa6astarts at character 968 of the hex dump, 773 characters of hex later, which means it's 386.5 bytes later, which means it's across a byte boundary. Your "file 001.txt" is 773 characters long, which isn't normally a valid length for a hex dump - hex dumps must have an even number of characters, since each byte of the input is 2 characters.-PONgrep- it's not doing you any favors there. In general, just dump the file withodorstringsor whatever andgrepthe results - you don't need to save a copy of the whole encoded file, though - you already have the other. Andgrepping stuff like that is already going to be tedious enough, and so maybe just keep that actual searches basic if you can.