Arch Linux pacman: List all "groups" that are "fully installed", i.e. all their member packages are installed on this system

pkg-list_fully_installed_groups

#!/bin/sh

set -e -u

tempprefix="$(basename "$0")"
tempdir="$(mktemp -d -t "${tempprefix}.XXXXXXXXXX")"
trap 'rm -rf "$tempdir"' EXIT

cd "$tempdir" || exit

pacman -Qgq | sort \
    > "installed_pkgs_plus_groupnames.txt"

cat "installed_pkgs_plus_groupnames.txt" \
    | awk '{print $1}' \
    | sort -u \
    > "installed_groups_including_partial.txt"

pacman -Sg $(cat "installed_groups_including_partial.txt") \
    | sort \
    > "all_group_pkgs_plus_groupnames.txt"

comm -13 "installed_pkgs_plus_groupnames.txt" "all_group_pkgs_plus_groupnames.txt" \
    | awk '{print $1}' \
    | sort -u \
    > "partially_installed_groups.txt"

comm -23 "installed_groups_including_partial.txt" "partially_installed_groups.txt" \
    > "fully_installed_groups.txt"

cat "fully_installed_groups.txt"