My issue is that this:
mysql -u root -p newdb -e "UPDATE newdb_users SET user_login='newuser', user_pass='$P$BJ7HEXzUXBqB74hw0H9KD2QvdnlwGv1' WHERE user_login='admin';"
does not update the "user_pass" field, but entering this:
UPDATE newdb_users SET user_login='newuser', user_pass='$P$BJ7HEXzUXBqB74hw0H9KD2QvdnlwGv1' WHERE user_login='admin';
directly in the MySQL console does. What am I missing?