the structure of the script

Hmm. You seem to do

1. read the list of questions in
2. print the first question
3. read the list of answers
4. print the first answer

Now, how would you go for a random question, considering that there can be multiple answers for a question?

1. read the list of questions in - ok
2. print a random question - ok
3. read the list of answers - ok
4. print … which answer???

Better control flow would be:

1. read the list of questionss and answers, preserving the relation between q and a
2. select a random q&a group
3. print the selected question
4. print the corresponding answers

Problem: you need a structure, yes, but not only of the script (control flow) but also for your data (be that arrays or objects). That might be possible with bash and grep, but that will be very specific and therefore difficult to translate to any other language, including Perl

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