This file is indexed.

preinst is in automake 1:1.14.1-2ubuntu1.

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 [ "$1" = "upgrade" ]; then
    if dpkg --compare-versions "$2" ge "1:1.11" && \
        dpkg --compare-versions "$2" lt "1:1.12"; then
        update-alternatives --remove automake /usr/bin/automake-1.11
    fi
    if dpkg --compare-versions "$2" ge "1:1.12" && \
        dpkg --compare-versions "$2" lt "1:1.13"; then
        update-alternatives --remove automake /usr/bin/automake-1.12
    fi
    if dpkg --compare-versions "$2" ge "1:1.13" && \
        dpkg --compare-versions "$2" lt "1:1.14"; then
        update-alternatives --remove automake /usr/bin/automake-1.13
    fi
fi