Thu, 25 Dec 2014 23:33:26 +0900 FUJIWARA Katsunori posix: quote the specified string only when it may have to be quoted
(0) -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 tip