Write a simple application to be written as a bash script to help those who work on crossword puzzles. The script should prompt the user to enter the known and unknown letters in the word, using '-' for each unknown letter, for example, "e-c-l-ent".After the user has entered the pattern followed by the "Enter" key, the script should list all words in the Linux dictionary that match the entered pattern. This script should give that user the option to continue or not. If yes, the script loops back and start again; if not, the script exits. The script takes no arguments and should be named crossword.