Trying to open a file at path. callback will receive any exceptions with the operation as its first argument, and a file descriptor as its second argument. Here, we open a file for reading:
fs.open("path.js", "r", (err, fileDescriptor) => { console.log(fileDescriptor); // An integer, like `7` or `23` });
flags receives a string indicating the types of operations the caller expects to perform on the returned file descriptor. Their meanings should be clear:
- r: Opening a file for reading, throwing an exception if the file doesn't exist.
- r+: Opening a file for both reading and writing, throwing an exception if the file doesn't exist.
- w: Opening a file for writing, creating the file if it doesn't exist, ...
