generate SHA512 hashed and verified passwords on OSX with either python2 or python3. Should work on other platforms as well.

generate_password_hash.sh

pip install passlib

cat << EOF | python
from __future__ import print_function;
from passlib.hash import sha512_crypt; 
import getpass; 
import sys, os;

hash = sha512_crypt.hash(getpass.getpass())
if sha512_crypt.verify(getpass.getpass("Verify password:"), hash):
  print(hash)
else:
  print("Passwords did not match.", file=sys.stderr)
  os.exit(1)
EOF