This file is indexed.

preinst is in libgc-dev 1:7.2d-5ubuntu2.

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

# Delete symlink that will be replaced by a directory
docdir="/usr/share/doc/libgc-dev"
if [ -L $docdir ]; then
    rm $docdir 2>/dev/null
fi