If you need to mass reset the password for some of your Drupal users, drush can help you.

The drush command to reset a user's password is:

drush upwd username --password="newpassword"

Now, let's say you need to reset 150 user's passwords.

  1. Create a file named accounts.txt with all usernames you want to reset (one per line)

  2. Run the following command:

    while read line; do drush upwd "$line" --password="newpassword"; done < accounts.txt