Exploring Expect

Resetting The Terminal Upon Exit

When an Expect script ends, the terminal modes are automatically restored to those that were in effect when the Expect script began. For example, if the script put the terminal into raw mode, the terminal is taken out of raw mode when the script ends. This occurs whether the exit command is called explicitly or the script simply ends.

This makes error handling a little easier especially while debugging. During script development, it is not uncommon to have the script blow up as errors are encountered. By default, when an error occurs, Expect restores the terminal modes and exits. This makes it very easy to recover even from severe errors in the script.