In the terminal, type:
security dump-keychain -d ~/Library/Keychains/login.keychain
If your passwords starts printing out right away, that means anyone using your computer can see all your passwords.
If you’ve seen enough passwords, type Control+C in your terminal to stop it.
You need to do this:
1. Open Up Keychain Access (Using SpotLight, Alfred, or Quicksilver)
2. Click on the lock Button
If your computer asks you to input your computer password, then now you know how IMPORTANT your computer password is. Never share it.