This file is indexed.

postrm is in mariadb-common 1:10.1.29-6.

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

case "$1" in
  remove|disappear)
    # New packaging paradigm for my.cnf handling among MySQL variants
    # Used in Ubuntu since Dec-2014 and in Debian since Jul-2015
    if [ -f /usr/share/mysql-common/configure-symlinks ]
    then
      /usr/share/mysql-common/configure-symlinks remove mariadb "/etc/mysql/mariadb.cnf"
    fi
  ;;
esac