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I apologize for the title but I am not even sure myself what to call this. I am going to use an example of a pizza delivery. I need to make an interactive script that allows users to order a certain...

Thanks for all your help. I have figured out the solution
until echo "$TextColour" | grep -iq "^"$TextColour"$" color_names.txt
do
read -p "please re-try: " TextColour
done

This is good.....although I think it would be easier using an until loop. You will have to edit this because i know its not going to be right but for example....
read -p "colour : " colour

until...

Thanks but that isnt what the problem is. I dont know how to loop it until the user enters a colour that is inside the color_names.txt file

Basically, I have a user input a colour into a variable, and then i echo that variable into a text file. Then I need to compare those 2 files which is easy using the diff command. The thing I can not...