Read a byte from the file.
read() inherits from the Stream utility class.
file: an instance of the File class (returned by SD.open())
The next byte (or character), or -1 if none is available.
The text of the 86Duino reference is a modification of the Arduino reference, and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.