В grep
любом случае вы можете использовать поиск файла - ему все равно, является ли входной файл текстовым или нет. От "man grep":
-a, --text
Process a binary file as if it were text; this is equivalent to the --binary-files=text option.
--binary-files=TYPE
If the first few bytes of a file indicate that the file contains binary data, assume that the file is
of type TYPE. By default, TYPE is binary, and grep normally outputs either a one-line message saying
that a binary file matches, or no message if there is no match. If TYPE is without-match, grep assumes
that a binary file does not match; this is equivalent to the -I option. If TYPE is text, grep
processes a binary file as if it were text; this is equivalent to the -a option. Warning: grep
--binary-files=text might output binary garbage, which can have nasty side effects if the output is a
terminal and if the terminal driver interprets some of it as commands.
Пожалуйста, отметьте слова предостережения в конце второго абзаца. Возможно, вы захотите перенаправить результаты из grep в новый файл и проверить это с помощью vi / less.