Thanks for explaining.
replyThat grep/sed difference on mac caused me issues so many times, always thought it was just Apple doing their own thing. I didn't realize it was a spec thing.
It's neither, really. OS X takes its command line utilities from BSD world, while Linux's mostly come from GNU. They're independent implementations, and GNU utilities are as a rule much more featureful than their BSD equivalents. Or much more bloated, depending on your point of view.
replyBoth aim to conform to the POSIX, but POSIX is a very spartan spec, people routinely use non-POSIX features without realizing it.
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