Disk file manipulation.
make System.file(name, mode): Opens a file.name: Name of file to open.mode: File mode (r = read, w = write, a = append, + = open for opposite mode too)stderr: Standard error.stdin: Standard input.stdout: Standard output.close(): Closes file and prevents further operations on this object.read(bytes): Read a stream of bytes into a string.bytes: Number of bytes to read.readline(): Read a single line of text into a string.seek(pos): Move current position in file.pos: Position in file to move to.tell(): Return current position in file.write(string): Write string to file.string: String to write.