shell小程序

#! /bin/sh

 

echo "Is it morning? Please answer yes or no."

read YES_OR_NO

if [ "$YES_OR_NO" = "yes" ]; then

  echo "Good morning!"

elif [ "$YES_OR_NO" = "no" ]; then

  echo "Good afternoon!"

else

  echo "Sorry, $YES_OR_NO not recognized. Enter yes or no."

  exit 1

fi

exit 0