title: Significance of 'flags' option in createReadStreams/createWriteStreams of Node.js?
body: <p>What is the significance of 'flags' option of <code>fs.createReadStream/createWritStream</code> while <code>ReadStream</code> and <code>WriteStream</code> of <code>fs</code> module are self-explanatory whether they are readable or writable?</p>