register_new_matrix_user -c homeserver.yaml -u alice -p 'secret' --admin --exists-ok
Create a user but skip if they already exist
The --exists-ok flag turns a duplicate registration into a no-op instead of an error, which makes provisioning scripts idempotent. If the user exists, their password and admin status are left untouched. Combine with --password-file for safe bulk onboarding. Without the flag, an existing user aborts the script.
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