When invoked as non-root, we would suggest re-running as root without any further hint. But this immediately spawns a machine from the local directory, which can be rather surprising. So let's give a better hint. (In general, I don't think commandline programs should do "significant" things when invoked without any arguments. In this regard it would be better if systemd-nspawn would not spawn a machine from the current directory if called with no arguments and at least "-D ." would be required.)
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