This file is indexed.

postrm is in postgresql-client-common 165+deb8u3.

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" = purge ]; then
    # remove psql history file
    rm -f /var/lib/postgresql/.psql_history
    rmdir /var/lib/postgresql/ 2>/dev/null || true
fi