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function sysusers -d "Find leftover users and groups from removed packages"
    diff (awk -F: '$3 < 1000 {print $1}' /etc/passwd | sort | psub) (systemd-sysusers --tldr | awk '$1 ~ /^u/ {print $2}' | grep -v nobody | sort | psub)
    diff (awk -F: '$3 < 1000 {print $1}' /etc/group | sort | psub) (systemd-sysusers --tldr | awk '$1 ~ /^u/ || $1 ~ /^g/ {print $2}' | grep -v nobody | sort | uniq | psub)
end