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Ask user in postinst for overwrite of config file


i have a package which provides a template config file. 
It asks several debconf questions and generate a config file inside /etc 
where all template variables was replaced with debconf responses. 

After a package upgrade i want to check if the generated config file was 
modified by user with a md5sum and ask the user if i can override the 
existing config file (only if different) with the new generated 
But a read inside postinst can't take a response from user. How can i do 
this? Is there a better solution for this problem?
Markus Schulz - msc@antzsystem.de

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