How do I prompt for Yes/No/Cancel input in a Linux shell script?

Question

I want to pause input in a shell script, and prompt the user for choices.
The standard Yes, No, or Cancel type question.
How d

Answer 1

As a friend of a one line command I used the following:

while [ -z $prompt ]; do read -p "Continue (y/n)?" choice;case "$choice" in y|Y ) prompt=true; break;; n|N ) exit 0;; esac; done; prompt=;

Written longform, it works like this:

while [ -z $prompt ];
  do read -p "Continue (y/n)?" choice;
  case "$choice" in
    y|Y ) prompt=true; break;;
    n|N ) exit 0;;
  esac;
done;
prompt=;