until loop

[ppatryk]

hey, lookin for some advice, I am getting the user to input a letter, A or B, I only want the user to type in A or B, so how would I make my scirpt to check if thats the input and return and error if its something else until the user types in A or B. Its a bash script btw
many thanks

[Cabhan]

This sounds a lot like a homework question, which are not allowed on this forum, so I am going to close this thread.

An until loop is basically a negated while loop, so you may want to look into those.