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#!/bin/bash
# Copyright 2011  Lars Wirzenius
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


set -e

comm -23 \
    <(dpkg --get-selections | awk '$2 == "install" { print $1 }' | sort) \
    <(apt-mark showauto | sort) |
while read pkg
do
    pri="$(dpkg --status $pkg | awk '/^Priority:/ { print $2 }')"
    case "$pri" in
        optional|extra) echo "$pkg" ;;
    esac
done