Sending arbitrary bytes to fgets from stdin [closed]

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Closed 3 years ago.

I'm prompting for a user supplied string using fgets(user_input, input_len, stdin). How can I send, for instance, the byte represented by hex \x04 to the program?

回答1:

You can do

$ echo -n -e '\x04' | your-program

NOTE: On POSIX echo only octal values are allowed.

回答2:

If you can get the bytes you want into a file, you can run

your-program < file

来源：https://stackoverflow.com/questions/36185321/sending-arbitrary-bytes-to-fgets-from-stdin