How do I prevent user to not to give an input in a specific location? (bash)

I write a basic script to test something. Let’s imagine I want to display the lines below (for no good reason): #!/bin/bash while true; do echo -e ” _____________________________________” echo -e “|_____________________________________|” echo -e “|_____________________________________|” echo -e “|_____________________________________|” echo -e “|_____________________________________|” echo -e “|_____________________________________|” read -p “Type a letter: ” letter done If I use…

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