-v -f utility

[Jerrad Pierce]

        grep -v -f patternsFile searchFile

seems to return the same result set as

        grep -f patternsFile searchFile

That's not very useful. One would expect this to return lines from searchFile
that do not match *any* of the patterns in patternsFile. This is grep 2.5.1. 

It's possible POSIX defines this behavior, but that doesn't means its correct.
Nor is GNU known for blindly following POSIX, see also POSIX_ME_HARDER.
-- 
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OkCTwsycb4S3DloZuMIYeXpLFqw5LaMhXC2ymhreVXNWMw9YGuAYdfmAbwomoPSyFJuFn2x8
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--
MOTD on Boomtime, the 37th of Chaos, in the YOLD 3172:
Alternative smock. --JP