node.js file watcher

File watcher to detect if a file has been changed.
[code language=”javascript”]
//usage: node watcher.js filename &
var fs = require(‘fs’);
var file = process.argv[2];
if(file) {
try {
fs.watch(file, function() {
console.log(file, "just changed.");
});
console.log("Start watching", file ,"for changes…");
} catch (e) {
if (e.errno === ‘ENOENT’) {
console.log("Error no such file", file);
} else {
console.log(e);
}
}
} else {
console.log("Please specify the file you want to watch.");
console.log(">$ node watcher.js filename &")
}
[/code]