This file is indexed.

preinst is in ruby2.0 2.0.0.484-1ubuntu2.

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" = "upgrade" ]; then
        update-alternatives --remove gem /usr/bin/gem2.0 || true
        update-alternatives --remove ruby /usr/bin/ruby2.0 || true
fi