!/bin/sh

#if-elif-else-fi

user_input_fruit = "";

echo -e "please input a kind of fruit:\r";

read user_input_fruit;

if [ $user_input_fruit = "apple" ]

then

    echo -e "You input \e[1;32mAPPLE\e[0m!\r";

elif [ $user_input_fruit = "grape" ]

then

    echo -e "You input \e[1;34mGRAPE\e[0m!\r";

else

    echo -e "Please input a kind of \e[1;36mFRUIT\e[0m!\r";

fi

!/bin/sh

#for-do-done

user_input_number=1;

echo "please input a number:";

read user_input_number;

i=0;

for (( $i=0; $i<$user_input_number; $i++))

do

    echo $i,"\r";

done

!/bin/sh

#while loop

n=10;

i=0;

while [ $i -le $n ]

do

    echo $i." ";

done

!/bin/sh

#case-in-;;-esac

user_input_genda="male";

echo "tell me your genda:\r";

read user_input_gendar;

case $user_input_gender in

    "male")

        echo "Wo, good man\r";;

    "female")

        echo "Ohh,smart girl\r";;

    *)

        echo "You must be jokking\r";;

esac