linux - 从 bash 脚本中的数字显示月份

Question

我试图证明，如果您输入月份的内容，它会显示月份 例如 january=1, february=2 , march=3 ...

和年份 2012,2013,2014...

但是，如果您输入的月份大于 12，它应该会告诉您 “抱歉”，而我无法弄清楚如何使该消息生效。

echo " please type a number for a month"
read month
echo " please type a number for a year"
read year

if [ "$month" = "1-12" ]
then
        cal "$month" "$year"
        sleep 2
        echo " thank you, good bye... "
else
        echo " sorry "  
        sleep 2
fi

Answer 1

if [[ $month -lt 13 && $month -gt 0  ]]  
then
        cal "$month" "$year"
        sleep 2
        echo " thank you, good bye... "
else
        echo " sorry "  
        sleep 2
fi