This file is indexed.

postinst is in acl 2.2.52-3build1.

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 [ "$1" = 'configure' ]; then
  for file in chacl getfacl setfacl; do
    if [ ! -e /usr/bin/$file ]; then
      ln -s /bin/$file /usr/bin/$file
    fi
  done
fi