Theoretically, there are many different things between SysV and BSD. However, in practice almost all systems now use what they deem to be the best parts of both systems. You will probably still see many things with BSD and SysV prepended in reference (ie, sysv ipc, bsd sockets, etc). Each system had it's own idiosyncracies both in the userland and kernel. In everyday use, apart from the odd option being different and naming conventions (eg, eth# versus <driver name>#), you will not really notice much which you are using - this is very true when you consider Linux and {Free,Open,Net}BSD.
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