function sysusers
    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