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testing postgres connection in shell script

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Old 01-12-2011
testing postgres connection in shell script
I have a script that does db query in postgres. I'm trying to put in some error checking in the script. I keep running into the password prompt problem where when invalid credentials/or database is put it, it would prompt me for a password which hangs the script. Is there a way that I can check for this kind of failure?
I have pgpass setup so if the crendentials/db/host are correct i will connect perfectly.

for example I have this in my script (with the wrong db), when I run this, it will prompt me for password.

query=`psql -d wrongdatabase -U user -h dbhost -c "select * from whatever;"`

Instead of prompting me for password I would like the script to just exit.
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LEARN ABOUT DEBIAN

wiki-toolkit-delete-node

WIKI-TOOLKIT-DELETE-NODE(1p)				User Contributed Perl Documentation			      WIKI-TOOLKIT-DELETE-NODE(1p)

NAME

       wiki-toolkit-delete-node - Delete a node stored in a Wiki::Toolkit instance.

SYNOPSIS

	 # Delete a node in a Wiki::Toolkit instance

	 wiki-toolkit-delete-node --type postgres
		  --name mywiki 
		  --user wiki  
		  --pass wiki 
		  --host 'db.example.com' 
		  --port 1234 
		  --nodename MyNodeName

	 wiki-toolkit-delete-node --type postgres
		  --name mywiki 
		  --user wiki  
		  --pass wiki 
		  --host 'db.example.com' 
		  --port 1234 
		  --id 2 
		  --version 7

DESCRIPTION

       Takes four mandatory arguments:

       type
	   The database type.  Should be one of 'postgres', 'mysql' and 'sqlite'.

       name
	   The database name.

       nodename
	   The name of the node to be deleted.

       id  The id of the node to be deleted

       four optional arguments:

       user
	   The user that connects to the database. It must have permission to create and drop tables in the database.

       pass
	   The user's database password.

       host
	   The hostname of the machine the database server is running on (omit for local databases).

       port
	   The port number that the database server is expecting connections to.

       version
	   The version number of the node to delete

AUTHOR

       Nick Burch

COPYRIGHT

	    Copyright (C) 2006 Nick Burch.  All Rights Reserved.

       This code is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       Wiki::Toolkit

perl v5.14.2							    2011-09-25					      WIKI-TOOLKIT-DELETE-NODE(1p)