This file is indexed.

postinst is in php-fpdf 3:1.8.1.dfsg-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" = configure ] && [ ! -L /usr/share/fpdf ] && dpkg --compare-versions "$2" lt-nl 1.53.dfsg-3; then
	rm -rf /usr/share/fpdf
	ln -s php/fpdf /usr/share/fpdf
fi