[CentOS] Old and new package version numbers during RPM update

Sun Jun 28 20:50:19 UTC 2015
Leon Fauster <leonfauster at googlemail.com>

Am 28.06.2015 um 17:50 schrieb John R Pierce <pierce at hogranch.com>:
> On 6/27/2015 5:38 PM, Anand Buddhdev wrote:
>> Thanks Joseph. I am aware of this option, but it would be only a last
>> resort, because checking the format of the config file is error-prone.
> why doesn't the config file have the version in it ?   not having that makes your whole system error prone.

normally config files have semantics that lets understand the 
parser the content. So, two accepting rules (regex) could be 
used to identify the config type of the file.