This file is indexed.

postinst is in grub-legacy-ec2 0.7.5-0ubuntu1.18.

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" ]; then
   mkdir -p /boot/grub
   update-grub-legacy-ec2 -y
fi