Re: BUG #19002: `pg_isready` unexpectedly succeeds on incorrect `--dbname` and/or `--username`

Samuel Marks <samuelmarks@gmail.com> writes:
> Hmm I suppose that works, but really I was using it as a "can i connect"
> check.

That's explicitly not its job.  Why don't you just try to connect?
Or if you want a command-line tool, consider

    psql ...connection options... -c 'select 1'

            regards, tom lane