This file is indexed.

preinst is in libperl-dev 5.26.1-6ubuntu0.3.

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 dpkg-maintscript-helper supports symlink_to_dir; then
    dpkg-maintscript-helper symlink_to_dir \
        /usr/share/doc/libperl-dev perl 5.22.1-7~ -- "$@"
fi