echo "Are you o.k. (y/n) ?"
read answer
if [ "$answer" = Y -o "$answer" = y ]
then
echo "Glad to hear it."
fi
if [ $answer = Y -o "$answer" = y ]
[: too many arguments
if [[ $answer == [Yy]* || $answer == Maybe ]]
then
echo "Glad to hear it."
fi
shopt -s extglob
answer="not really"
if [[ $answer = [Nn]o?( way|t really) ]] #脚本运行时此处发生错误
then
echo "So sorry. "
fi
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