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./bash-file.sh: 第 3 列：[: 缺少「]」
./bash-file.sh: 第 3 列：[: 缺少「]」
./bash-file.sh: 第 3 列：[: 缺少「]」
./bash-file.sh: 第 5 列：[: 缺少「]」
./bash-file.sh: 第 5 列：[: 缺少「]」
./bash-file.sh: 第 5 列：[: 缺少「]」
Inputfailed.

#!/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

$ bash -x bash-file.sh
+ read -p '請輸入 Yes 或者 No: ' choose
請輸入 Yes 或者 No: y
+ '[y' == 'Yes]'
bash-file.sh: 列 3: [y：命令找不到
+ '[y' == 'Y]'
bash-file.sh: 列 3: [y：命令找不到
+ '[y' == 'y]'
bash-file.sh: 列 3: [y：命令找不到
+ '[y' == 'No]'
bash-file.sh: 列 5: [y：命令找不到
+ '[y' == 'N]'
bash-file.sh: 列 5: [y：命令找不到
+ '[y' == 'n]'
bash-file.sh: 列 5: [y：命令找不到
+ echo Inputfailed.
Inputfailed.

#!/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

$ bash -x bash-file.sh
+ read -p '請輸入 Yes 或者 No: ' choose
請輸入 Yes 或者 No: 
+ '[' == 'Yes]'
bash-file.sh: 第 3 列：[: 缺少「]」
+ '[' == 'Y]'
bash-file.sh: 第 3 列：[: 缺少「]」
+ '[' == 'y]'
bash-file.sh: 第 3 列：[: 缺少「]」
+ '[' == 'No]'
bash-file.sh: 第 5 列：[: 缺少「]」
+ '[' == 'N]'
bash-file.sh: 第 5 列：[: 缺少「]」
+ '[' == 'n]'
bash-file.sh: 第 5 列：[: 缺少「]」
+ echo Inputfailed.
Inputfailed.