Message-ID: <ac2d7977b5f819a21eb7af93c9e954ab9fefbb5f.camel@cybertec.at>
Subject: Re: Update "usename" in pg_user
From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Bernd Lentes <bernd.lentes@helmholtz-muenchen.de>, Paul Smith*
	 <paul@pscs.co.uk>, "pgsql-admin@lists.postgresql.org"
	 <pgsql-admin@lists.postgresql.org>
Date: Tue, 14 Nov 2023 17:42:00 +0100
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On Tue, 2023-11-14 at 13:20 +0000, Bernd Lentes wrote:
> >=20
> > ALTER USER <username> RENAME TO <new_username> is what you want
>=20
> thanks. Can I do this for all users in one turn ?

You can use the psql client and run

  SELECT format('ALTER ROLE %I rename to %I',
                usename,
                usename || 'helmholtz-munich.de')
  FROM pg_user
  WHERE usename <> 'postgres' \gexec

\gexec will automatically execute each result line as an SQL statement.

Yours,
Laurenz Albe