How to reset the password for local users

All local user passwords are stored in /etc/op5/auth_users.yml, and they are listed as blocks like these. The string "$1$VGn0CdSG$AMJjvHoF8M2nSy8SiPrW70" is a hash of the password "monitor":

monitor:
  username: "monitor"
  realname: "Monitor Admin"
  password: "$1$VGn0CdSG$AMJjvHoF8M2nSy8SiPrW70"
  groups:
    - "admins"
  password_algo: "crypt"
  modules:
    - "Default" 

The monitor command that changes the local users, including their passwords, is "/usr/bin/op5-manage-users". Running 'op5-manage-users' without any arguments prints its syntax help:

monitor:
This is a small helper for adding/changing/deleting users in op5 Monitor.

Create/edit user:
  /usr/bin/op5-manage-users --update --username=<username> (--password=<password>) --module=<module1> [--module=<modulen>] [--realname=<realname> --group=<group1> [--group=<groupn>]]
  --username    User's username
  --password    Password is only required if an authentication module that requires passwords is chosen
  --module      Authentication module that should be used for this user
  --realname    Full name of user
  --group       User's group memberships

Delete user:
	/usr/bin/op5-manage-users --remove --username=<username>

Here is an syntax example for creating a new Monitor user, 'gord':

monitor:
/usr/bin/op5-manage-users --update --username=gord --realname="Wheat King" --modules=Default --password=100thMeridian --group=admins 

Here is the resulting content in 'auth_users.yml':

monitor:
gord:
  username: "gord"
  realname: "Wheat King"
  password: "$1$s4gwhkvu$2ZB0.yHVSkcxWUtxtuLYX0"
  password_algo: "crypt"
  modules:
    - "Default"
  groups:
    - "admins" 

Important Caveats --

• 'op5-manage-users' does not append; it only overwrites every entry for the user. For example, attempting to change only the group of the user created earlier:

  monitor:
      op5-manage-users --update --username=gord --group=limited_edit 

  ...leads to this being the entire entry for the user. The password and all other entries have been removed:

  monitor:
  gord:
    username: "gord"
    groups:
      - "limited_edit" 

• Changing the variable order in the command will move the user's real name to the bottom of the file entry. For example, this will run successfully:

  monitor:
  op5-manage-users --update --username=jfriday --realname="Sgt. Joe Friday" --group=admins --password=Badge714 --modules=Default
  

  The resulting entry in 'auth_users.yml' can be difficult for a user to parse:

  monitor:
  jfriday:
    username: "jfriday"
    password: "$1$DTVh5ZeF$Tm1WeJDyH2AaY3FQ21Li4."
    password_algo: "crypt"
    modules:
      - "Default"
    groups:
      - "admins"
    realname: "Sgt. Joe Friday"