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mongosh --host localhost:27017 -u admin -p xxxxxxxx --authenticationDatabase admin

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db.createUser({
  user: "username",
  pwd: "password",
  roles: [{role: "readWrite", db: "database"}]
});

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db.updateUser("username", {
  pwd: "password"
});

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db.dropUser("username");

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db.changeUserPassword(
  "username",
  "password"
)

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db.createRole({
  role: "readSpecificCollections",
  privileges: [
    { 
      resource: { db: "my_database", collection: "products" }, 
      actions: ["find"] 
    },
    { 
      resource: { db: "my_database", collection: "inventory" }, 
      actions: ["find"] 
    }
  ],
  roles: []
});