Bulk add users

Is there a non hacky way to bulk add users?
I have 150+ users to add into the same group and it's painful to add them one by one.

Afaik, the best option is to write a script which adds the users using the API:

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Cheers. Presumably this will also send the email alert by default - will test, but would like the ability to suppress the alert if I fire over the API.

I answered this on a separate topic