Keeping other applications from detecting keystrokes in Terminal
You can set up Terminal to allow secure keyboard entry. This prevents other applications on your computer or the network from detecting and recording what you type in Terminal. Before you turn this option on, make sure other applications on your own computer don't need this information.
To turn on secure keyboard entry:
In Terminal, choose File > Secure Keyboard Entry.
A checkmark next to Secure Keyboard Entry in the menu lets you know it's enabled.