使用case（列舉條件選擇）就能夠實現

#!/bin/bash
echo "1. China"
echo "2. USA"
echo "3. England"
read -p "Please choose your country: " i
case "$i" in
        1)
        echo "Your country is China."
        ;;
        2)
        echo "Your country is USA."
        ;;
        3)
        echo "Your country is England."
        ;;
        *)
        echo "Please choose a right item."

esac

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