This file is indexed.

postinst is in crawl 2:0.21.1-1.

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

# Work around dpkg failing to replace directiories with a symlink.
DOC=/usr/share/doc/crawl
if rmdir $DOC 2>/dev/null
  then ln -sf /usr/share/doc/crawl-common $DOC
fi