node index.js--错误

$ node index.js

module.js:471
    throw err;
    ^

Error: Cannot find module '/home/josh/index.js'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:383:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:496:3

安装最新版本的npm可以解决上面问题：
sudo npm install npm@latest -g