UNIX for Dummies Questions & Answers

#!/bin/bash

echo " enter your age "
read age

if [ $age <= 18 ]; then
echo " you do not have to pay tax "

elif [[ $age -gt 18  &&  $age -lt 65 ]]; then
echo " you are eligible for income tax "

else
echo " you dont have to pay tax "

fi

if [[ $age -gt 18  &&  $age -lt 65 ]]; then
    echo " you are eligible for income tax "
else
    echo " you dont have to pay tax "
fi

if (( age <= 18 && age > 65 )); then
     echo " you do not have to pay tax"
else
     echo " you are eligible for income tax"
fi