How to get current running version of a package in dpkg postinst and preinst script

by user3038057   Last Updated November 20, 2017 09:02 AM

I am creating a debian package that discard some database operations carried out in postinst script of the package if its previous version is installed. I googled and I find it for RPM but I could not find for debian.

I am wondering if there is an equivalent variable or something of %pre[un] or %post[un] for debian ?


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