Bash script to test shadow user (sha512) with awk and python crypt getpass modules

testpwd.sh

#/bin/bash
# testpwd.sh
user=$1
dic=$2
shadow=/etc/shadow
original=$(<$shadow awk -v user=$user -F : 'user == $1 {print $2}')
prefix=${original%"${original#\$*\$*\$}"}
for pass in $(cat $dic); do
  echo "Password : $pass"
  computed=$(python -c "import crypt, getpass, pwd; print crypt.crypt('$pass', '$prefix')")
  echo "Original : $original"; echo "Computed : $computed"
  if [ "$computed" = "$original" ]; then echo "Matched !!!" ; else echo "No match"; fi
done