P934A1N2 says to YSITD
#!/usr/bin/env bash read -p "請輸入 Yes 或者 No: " choose if ["${choose}" == "Yes"] || ["${choose}" == "Y"] || ["${choose}" == "y"]; then echo "User input ${choose}, return Yes" elif ["${choose}" == "No"] || ["${choose}" == "N"] || ["${choose}" == "n"]; then echo "User input ${choose}, return No." else echo "Inputfailed." fi