read -s -p 'Enter your password: ' PW1
echo
read -s -p 'Enter your password (again): ' PW2
echo
if [ $PW1 != $PW2 ]; then
        echo "Passwords don't match"
        exit 1
fi
FV=`echo -n $PW1 $1`
for i in $(seq 100); do
        IV=$(echo -n $FV | shasum - | cut -f 1 -d ' ')
        FV=$IV
done
echo $FV