I am trying to make a Node.js script to analyse disk usage. For this,

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Asked: June 2, 20262026-06-02T02:52:39+00:00 2026-06-02T02:52:39+00:00

I am trying to make a Node.js script to analyse disk usage. For this,

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I am trying to make a Node.js script to analyse disk usage. For this, I shell out to du, but I am having trouble figuring out how to read the output from the child process line by line. Here’s what I’ve tried so far:

var spawn = require("child_process").spawn,
    rl = require('readline'),
    du = spawn('du', ['/home']);
    linereader = rl.createInterface(du.stdout, du.stdin);

// Read line by line.
//du.stdout.on('data', function (data) {
linereader.on('line', function (data) {
  console.log(data);
});

du.stdout.on('data' just reads chunks of data, and while readline should supposedly split its input by line, it doesn’t, instead I get the exact same data (du.stdout returns a buffer, but calling .toString() on it gives me the same data I got with linereader).