This file is indexed.

postrm is in dnsmasq-base 2.75-1.

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 [ purge = "$1" ]; then
   if [ -x "$(command -v deluser)" ]; then
     deluser --quiet --system dnsmasq > /dev/null || true
  else
     echo >&2 "not removing dnsmasq system account because deluser command was not found"
  fi
  rm -rf /var/run/dnsmasq
fi