Need some help understanding what poudriere-ports(8) does... Specifically when I run the command 
				
			 poudriere ports -u... I tried googling around, but have been unable to find any usable examples of specifically that option. I can imagine it's something like  portsnap extract math/adol-c (assuming that math/adol-c is the port I want to update). portsnap extract will clean out the work/ subdirectory, but respect any makefile knobs I modify, and I like that.  I just want to learn about the behavior of  poudriere ports -u... can I feed a list into that, or not? 
			     
 
		 
 
		