Use find on linux (as per mac)

Though the command is slightly different, so fork the code logic. This will still fall back to alternative method if find isn't available.

Ref #419

lib/config/checkWatchSupport.js

@@ -44,9 +44,10 @@ function checkWatchSupport(config, callback) {
   // up all over your screen like this: http://d.pr/i/R6B8+
   // even with higher ulimit -n Mac has another problem: https://github.com/joyent/node/issues/5463
   // This will be fixed in 0.12, before then we default to find
-  config.system.useFind = utils.isMac || !fs.watch;
+  config.system.useFind = utils.isMac || utils.isLinux || !fs.watch;
+  var mtime = utils.isMac ? '-mtime -1s' : '-mmin -0.01';
   if (config.system.useFind) {
-    exec('find -L /dev/null -type f -mtime -1s -print', function(error) {
+    exec('find -L /dev/null -type f ' + mtime + ' -print', function(error) {
       if (error) {
         if (!fs.watch) {
           utils.log.error('The version of node you are using combined with the version of find being used does not support watching files. Upgrade to a newer version of node, or install a version of find that supports search by seconds.');

lib/monitor/watch.js

@@ -68,9 +68,12 @@ bus.on('config:update', function () {
     // command (mac only oddly)
     changeFunction = function (lastStarted, callback) {
       var cmds = [];
+      var offset = ((Date.now() - config.lastStarted)/1000|0);
+      var mtime = utils.isMac ? '-mtime -' + offset + 's' : '-mmin -' + (offset/100);
+
 
       config.dirs.forEach(function(dir) {
-        cmds.push('find -L "' + dir + '" ' + ignoredFileTypesForFind(dir) + ' \\( -type f -and -mtime -' + ((Date.now() - config.lastStarted)/1000|0) + 's -print \\)');
+        cmds.push('find -L "' + dir + '" ' + ignoredFileTypesForFind(dir) + ' \\( -type f -and ' + mtime + ' -print \\)');
       });
 
       exec(cmds.join(';'), function (error, stdout) {

lib/utils/index.js

@@ -8,6 +8,7 @@ var utils = module.exports = {
   bus: require('./bus'),
   isWindows: process.platform === 'win32',
   isMac: process.platform === 'darwin',
+  isLinux: process.platform === 'linux',
   isRequired: (function () {
     var p = module;
     while (p = p.parent) {