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rio: add a hint on how " and "" work

--- a/rio-tips-and-tricks.md

+++ b/rio-tips-and-tricks.md

@@ -22,6 +22,8 @@

 		term% lc /tmp

 	1

+Hint: `grep '^term% ' /dev/text`.

+

 If there is a command you want to run repeatedly, it's easy to define a rc function and use it instead:

 	fn t { mk && ./6.out some arguments here >log && grep something log }