OK, glad to know they are supported. Indeed, $ join <(printf "%s\n" 'a 1' 'b 2' 'b 3' 'c 4') <(printf "%s\n" a b 'b 5' c c) a 1 b 2 b 2 5 b 3 b 3 5 c 4 c 4
So be sure to mention it wherever you mention files must be in sorted order. I mean probably if you don't mention it, nobody will be sure what the behavior will be.
