title: Permission denied in mac terminal
body: <p>I'm trying to write a command on mac terminal using the root, but it shows me that the permission denied, when I use the sudo it shows that the command not found </p>
  
  <p>can any one please help me</p>
  
  <pre><code>aftheers-MacBook-Air:scripts root# ./ArduinoWifiShield_upgrade.sh
  -sh: ./ArduinoWifiShield_upgrade.sh: Permission denied
  </code></pre>