This file is indexed.

postinst is in postgresql-filedump 10.0-1build1.

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
  configure)
    update-alternatives --quiet --install /usr/bin/pg_filedump pg_filedump \
      /usr/lib/postgresql/10/bin/pg_filedump 100
    ;;
esac