NodeJS: check disk usage and output remaining space if under 10%

check_disk_usage.js

var disk = require('diskusage');
 
disk.check('/', function(err, info) {
  function toGB(x) { return (x / (1024 * 1024 * 1024)).toFixed(1); }
  var percentAvailable = ((info.available / info.total) * 100);
  if (percentAvailable < 10) { console.log('Warning only ' + toGB(info.available) + 'GB (' + percentAvailable.toFixed(1) + '%) space available!'); }
});