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minor curiosity with "ps"

I managed to get off on a tangent that went something like this:

I needed to understand the output of the ps command a bit better than I
did. I looked at the man page. Hmmm... Look at ALL those nifty keywords. I
copied that section of text, did some editing and submitted the whole mess
of keywords to see what would happen. Amongst other things, there was
this...

ps: poip: keyword not found
ps: rlink: keyword not found
ps: rtprio: keyword not found
ps: sigcatch: keyword not found
ps: sigignore: keyword not found
ps: uprocp: keyword not found

OK, the man page and the program a little out of step. Then I noticed that
-L would "List the set of available keywords." Ah, straight from the
horse's mouth - what could be more authoritative. So I did the ps -L, took
the resulting list and edited it into the test command in place of the list
from the man page, issued this command and amongst other things, there was
this...

ps: sigcatch: keyword not found
ps: sigignore: keyword not found

...which struck me as odd because the list of keywords is supposedly the
list the program itself says it handles. It struck me as even odder when I
could not find either of those keywords in the command that gave the output.

Now, I'm not running the very latest cutting edge Mac OS X update so this
may all be old hat (for which I apologize in advance) and may even have
been resolved. In the latter case, as my mentor, Emily Latella used to say,
"Never mind."
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