Watch File And List File Information By Spawning A Process

watch_file_spawn_process.js

var fs = require('fs');
var spawnProcess = require('child_process').spawn;
var filename = 'some/file'

fs.watch(filename, function() {
  var list = spawnProcess('ls', ['-lh', filename]);
  var info = '';
  
  // listener get invoked every time a chunk of data is available. Data is read in chunks
  list.stdout.on('data', function(chunk) {
    output += chunk.toString();
  });
  
  // When child process exit, it emits the close event
  list.on('close', function() {
    var parts = output.split(/\s+/);
    console.dir([parts[0], parts[4], parts[8]]);
  });
});