[R] Help saving multiple graphics

[briandavispdx]

I'm a new-ish user using a for loop to create many hundreds of plots.  I'm
using the "par" function to create them in a 2x2 graphics window.  

What I'd like to do is output this 4-up graphic to a file every four plots. 
I really don't care what the filename is, but it would be useful to be able
to specify something like "plotnum_1."

Any tips on how to go about this? 
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