Date: Tue, 14 Jun 2011 12:13:56 -0700 (PDT)
From: sundaram <sundaram.bioreliance@gmail.com>
To: pgsql-admin@postgresql.org
Message-ID: <1308078836071-4488964.post@n5.nabble.com>
In-Reply-To: <fu25vb$oii$1@ger.gmane.org>
References: <48048E3E.2090807@megafon.hr> <fu25vb$oii$1@ger.gmane.org>
Subject: Re: psql shell return codes - checking if database exists
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Perhaps the grep solution will only provide an accurate response if the
database name is not a substring of some other database name.

In other words, if one were to attempt to confirm that database prod10
exists- they might execute (per the suggestion):
psql --list | grep prod10

But, the result could be misleading if the following databases also exist on
the same server:
prod100
prod101
prod1000
myprod10
yourprod101
etc.

I would like to suggest querying directly from the system table pg_database
like this:
psql --tuples-only --command "select * from pg_database where datname =
'prod10';"

You can pipe and process the result as appropriate for your needs.

--
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