array SHELL PROGRAMMING

z=0
menu=0

input(){
            let z=$z+1
            echo -n "Masukkan Nomor Nota   : "
            read nomor[$z]
            echo -n "Masukkan Jenis BBM    : "
            read jenis[$z]
            echo -n "Masukkan Jumlah liter : "
            read liter[$z]
            echo -n "Masukkan Harga/liter  : Rp."
            read harga[$z]
            let total[$z]=${liter[$z]}*${harga[$z]}
            echo "Total                 : Rp.${total[$z]}"
}

view(){
            for((a=1;a<=z;a++))
            do
                        echo "- - -$a- - -"
                        echo "Nomor Nota : ${nomor[$a]}"
                        echo "Jenis BBM  : ${jenis[$a]}"
                        echo "Liter      : ${liter[$a]}"
                        echo "Harga/liter: Rp.${harga[$a]}"
                        echo "Total      : Rp.${total[$a]}"
            done
}

search(){
            echo -n "Masukkan Nomor Nota : "
            read cari
            a=0
            b=0
            while [ $a -le $z ] && [ $b == 0 ]
            do
                        let a=$a+1
                        if [ "${nomor[a]}" == $cari ]
                        then
                                    b=1
                        fi
            done
}

update(){
            search
            if [ $a -le $z ]
            then
                        echo "Nomor Nota : ${nomor[$a]}"
                        echo "Jenis BBM  : ${jenis[$a]}"
                        echo "Liter      : ${liter[$a]}"
                        echo "Harga/liter: ${harga[$a]}"
                        echo "Total      : ${total[$a]}"
                        echo "- - --- - -"
                        echo -n "Masukkan Nomor Nota   : "
                        read nomor[$a]
                        echo -n "Masukkan Jenis BBM    : "
                        read jenis[$a]
                        echo -n "Masukkan Jumlah liter : "
                        read liter[$a]
                        echo -n "Masukkan Harga/liter  : "
                        read harga[$a]
                        let total[$a]=${liter[$a]}*${harga[$a]}
                        echo "Total                 : ${total[$a]}"
            else
                        echo "Data Tidak Ada"
            fi
}

delete(){
            search
            if [ $a -gt $z ]
            then
                        echo "Data Tidak Ada"
            else
                        while [ $a -lt $z ]
                        do
                                    let b=$a+1
                                    nomor[$a]=${nomor[$b]}
                                    jenis[$a]=${jenis[$b]}
                                    liter[$a]=${liter[$b]}
                                    harga[$a]=${harga[$b]}
                                    total[$a]=${total[$b]}
                                    let a=$a+1
                        done
                        let z=$z-1
                        echo "Data $cari Berhasil Dihapus"
            fi
}

cetak(){
            search
            if [ $a -le $z ]
            then
                        echo "Nomor Nota : ${nomor[$a]}"
                        echo "Jenis BBM  : ${jenis[$a]}"
                        echo "Liter      : ${liter[$a]}"
                        echo "Harga/liter: ${harga[$a]}"
                        echo "Total      : ${total[$a]}"
            else
                        echo "Data Tidak Ada"
            fi
}

while [ $menu != 6 ]
do
            echo "1.Input    4.Delete"
            echo "2.View     5.Search"
            echo "3.Update   6.Exit"
            echo -n " : "
            read menu
            if [ $menu -eq 1 ]
            then
                        input
            elif [ $menu -eq 2 ]
            then
                        if [ $z -lt 1 ]
                        then
                                    echo "kosong "
                        else
                                    view
                        fi
            elif [ $menu -eq 3 ]
            then
                        update
            elif [ $menu -eq 4 ]
            then
                        delete
            elif [ $menu -eq 5 ]
            then
                        cetak
            elif [ $menu -eq 6 ]
            then
                        echo "Keluar"
            else
                        echo "Salah "
            fi
            echo ""
done