This file is indexed.

postrm is in mysql-common 5.5.22-0ubuntu1.

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/bash -e

if [ "$1" = "purge" ]; then
  rmdir /etc/mysql 2>/dev/null || true
fi