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#!/bin/bash
grps=($(sed -n -e 's/#.*//;s/^g://p' < packages.txt))
pkgs=($(sed -n -e 's/#.*//;s/^p://p' < packages.txt))
echo ' => In packages.txt, but not installed'
comm -13 \
<(pacman -Qq|sort -u) \
<({ pacman -Qgq -- "${grps[@]}"; printf '%s\n' "${pkgs[@]}"; }|sort -u) |
sed 's|^| -> |'
echo ' => Installed explicitly, but not in packages.txt'
comm -23 \
<(pacman -Qetq|sort -u) \
<({ pacman -Qgq -- "${grps[@]}"; printf '%s\n' "${pkgs[@]}"; }|sort -u) |
sed 's|^| -> |'
echo ' => Installed as dependencies, but no longer needed'
pacman -Qdtq|sort -u |sed 's|^| -> |'
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