This file is indexed.

preinst is in ibus-doc 1.5.11-1ubuntu2.

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

case "$1" in
    install|upgrade)
        if [ -d /usr/share/gtk-doc/html/ibus ]; then
            rm -rf /usr/share/gtk-doc/html/ibus >/dev/null || true
        fi
    ;;

    abort-upgrade)

    ;;

    *)
        echo "preinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac