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For OpenBSD versions prior to 5.7 the `-h` option _must_ be provided to the `shutdown` command when `-p` is used. Later versions no longer require the `-h` option but still allow it for compatibility. http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sbin/shutdown/shutdown.8?rev=1.40&content-type=text/x-cvsweb-markup http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sbin/shutdown/shutdown.c?rev=1.40&content-type=text/x-cvsweb-markup