This file is indexed.

prerm is in mysql-common 5.7.25-0ubuntu0.16.04.2.

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 [ "$1" = "remove" ]; then
  update-alternatives --remove my.cnf /etc/mysql/my.cnf.fallback
fi

# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/mysql/my.cnf 5.6.22-1~ mysql-common -- "$@"
# End automatically added section
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/mysql/conf.d/.keepme 5.6.22-1~ mysql-common -- "$@"
# End automatically added section