This file is indexed.

postinst is in postgresql-filedump 9.0.0-1.

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

case "$1" in
  configure)
        update-alternatives --quiet --install /usr/bin/pg_filedump pg_filedump \
	  	/usr/lib/postgresql/8.4/bin/pg_filedump 84 
	;;
  *)
esac