This file is indexed.

preinst is in libtiff-opengl 3.9.5-2ubuntu1.

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 [ "x$1" = "xupgrade" -a \
     -d /usr/share/doc/libtiff-opengl -a ! -h /usr/share/doc/libtiff-opengl ]; then
  rm -rf /usr/share/doc/libtiff-opengl
fi