Program Shell Hitung Luas Persegi dan Segitiga

#!/bin/bash
lagi=’y';
while [ $lagi == 'y' ] || [ $lagi == 'Y' ];
do
clear;
echo ” -=Hitung Luas=-”;
echo ” 1. Persegi “;
echo ” 2. Segitiga “;
echo ” 3. Exit “;
read -p ” Operasi yang akan dilakukan [1-3] : ” pil;
if [ $pil -eq 1 ]; then
echo “=Persegi= “;
echo -n “Masukkan Panjang : “;
read panjang;
echo -n “Masukkan Lebar : “;
read lebar;
let luas=$panjang*$lebar;
echo “Luas Persegi : $luas”;
elif [ $pil -eq 2 ]; then
echo “=Segitiga= “;
echo -n “Masukkan Alas : “;
read alas;
echo -n “Masukkan Tinggi : “;
read tinggi;
let luas=$alas*$tinggi/2;
echo “Hasil pengurangan :$luas” ;
elif [ $pil -eq 3 ]; then
echo “Exit…..”;
exit 0;
else
echo “anda salah memasukan pilihan”
fi
echo -n “Hitung lagi (y/t) :”;
read lagi;
done

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