Asking a Yes/No Question from a Bash Script

"The function is pretty simple it accepts a couple of options and the remainder of the arguments are presumed to be the question text. It prompts the user for an answer and validates that the answer is one of "yes", "y", "no", or "n". The answer is converted to lower case so any combination of case is accepted.

"The available options are --timeout N which causes the prompt to timeout after N seconds, and --default ANS which provides a default answer for prompts that timeout. It also allows the user to hit ENTER and accept the default answer. The function code follows:"

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