Files are composed of ordered bytes, and these bytes are addressable by their position, relative to the beginning of in the file (position zero [0]). Once we have a file descriptor fd, we can begin to read length number of bytes and insert those into a Buffer object buffer, insertion beginning at a given buffer offset. For example, to copy the 8,366 bytes beginning at position 309 of the readable file fd into a buffer beginning at an offset of 100, we will use fs.read(fd, buffer, 100, 8366, 309, callback).
The following code demonstrates how to open and read a file in 512 byte chunks:
fs.open('path.js', 'r', (err, fd) => { fs.fstat(fd, (err, stats) => { let totalBytes = stats.size; ...
