Can portupgrade upgrade itself?

[Tom Parquette]

I've been automating some routine stuff on my machine and one of them is 
cvsuping ports-all and pulling the distfiles overnight (while everybody 
is asleep.)  Keeping portupgrade right up to date feels like the right 
thing to do and I was thinking about adding this to the shell script I'm 
writing.

This sounds like a chicken and egg question but, can the portupgrade 
tool safely upgrade itself? In other words, adding portupgrade -Rr 
portupgrade in the script after the cvsup run.
TIA...

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