Re: What are the { curly } brackets for in main.cf?

[Jeff Sherk Forerunner Ministries]

On 6/21/2010 11:47 AM, Noel Jones wrote:
On 6/21/2010 12:44 PM, Jeff Sherk Forerunner Ministries wrote:
I notice lines like these:
indexed = ${default_database_type 
<http://www.postfix.org/postconf.5.html#default_database_type>}:${config_directory 
<http://www.postfix.org/postconf.5.html#config_directory>}/

smtp_generic_maps
<http://www.postfix.org/postconf.5.html#smtp_generic_maps> =
${indexed}generic

What are the { curly } brackets for?
What does {indexed} do?

Thanks
http://www.postfix.org/postconf.5.html

Ok reading that doc, it looks like ${default_database_type} and 
$default_database_type are identical then?

And as far as ${indexed}generic , I am assuming that it becomes $generic 
because there is no indexed variable defined?

Thanks