Disable Command-W in the terminal

Is there any way to disable Command+W in the terminal?

On several occasions I have accidentally closed a terminal window containing important information when I meant to close a Safari tab and did not realize that the terminal was the active window.

To disable ⌘W in Terminal, do the following:

• From the  menu in the top left corner of the screen, select System Preferences. Click on Keyboard then Keyboard Shortcuts then Application Shortcuts.

• Click the + button to add a new shortcut

• Select "Terminal.app" for the application, and for the command, type Close Window (this is case sensitive). In the shortcut box, give it a different shortcut, like ⌘ControlW

• Now ⌘W will not close your terminal windows.

You can set a prompt before closing in the preferences:

Terminal Preferences → Settings → Shell