undocumented feature: NRPE/check_nrpe version query command

[Matthias Eble]

Hi Ethan, hi list,

I found the internal _NRPE_CHECK command in the nrpe sources some months 
ago and found it very useful.
It can be used to remotely query nrpe's version:

# check_nrpe -H somehost -c _NRPE_CHECK
NRPE v2.8.1

It's unforutnately undocumented. Don't know if you want to include it in 
the PDF or whatever.

Now it's at least documented in the list archives..
Maybe its valuable to someone.

And: Yes, I should update :D

Matthias

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