shell - シェルスクリプト if then else loop scp

Question

User=0
av="653"
ma="727"
pr="713"
mi="234"
n=192.168.1.20:/root/Ma
echo "Please select av ma ji im pr"
echo -n "First 2 initial of your Name eg: [av ma ji im pr]? "
read User
if [ "$User" = av ]
then
    echo `scp $User@$n .`
elif [ "$User" = ma ]
then    
    echo `scp $User@$n .`
elif [ "$User" = pr ]
then
    echo `scp $User@$n .`
elif [ "$User" = mi ]
then
    echo `scp $User@$n .`
else
    echo "UNKNOWN USER"
fi

スクリプトが正しく機能していません。av653の値が欲しい