This file is indexed.

postrm is in libunwind-setjmp0 1.1-4.1.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e
if [ remove = "$1" ]; then
       dpkg-divert --package libunwind-setjmp0 --remove --rename --divert /usr/lib/x86_64-linux-gnu/libunwind-setjmp.so.0.0.0.old /usr/lib/x86_64-linux-gnu/libunwind-setjmp.so.0.0.0
       dpkg-divert --package libunwind-setjmp0 --remove --rename --divert /usr/lib/x86_64-linux-gnu/libunwind-setjmp.so.0.old /usr/lib/x86_64-linux-gnu/libunwind-setjmp.so.0
fi