On Friday 2009-02-13 14:12, Evgeniy Polyakov wrote:
>On Fri, Feb 13, 2009 at 02:03:10PM +0100, Jan Engelhardt (jengelh@xxxxxxxxxx) wrote:
>> >> > printf("OS fingerprint match options:\n"
>> >> > "--genre [!] string Match a OS genre by passive fingerprinting.\n"
>> >>
>> >> The syntax should be [!] --genre string, that is what most
>> >> others use. Then the check_inverse call also be removed.
>> >
>> >Actually not, it has genre not Linux (Windows, Solaris, HPUX and so on).
>>
>> It may not coincide with English grammar, but it is easier to parse.
>
>'! --genre Linux' means this option was not specified,
>'--genre ! Linux' means everything but Linux.
Well not in iptables. Not specifying an option is represented by
voidness/absence of any string. (E.g. iptables -d 192.168.0.0/16 vs.
iptables ! -s 172.16.0.0/12 -d 192.168.0.0/16)
Also, (!(--genre == "linux")) is eqv. (--genre != "linux")
is equivalent in boolean logic ;-)
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