Non-Perl but baffling question

[John Horner]

I have an OSX machine used as a server in another room.

I nearly always get to it via a shell app.

I can't remember the exact version of X that's on it.

How do I find out if it's 10.1.3 or 10.1.5 from the command-line?

To try and make this on topic, in case anyone doesn't know, the way 
to do this for perl is just "perl -v".
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John Horner                            (+612 / 02) 9333 2110
Senior Developer, ABC Online              http://abc.net.au/
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