On Sat, Dec 13, 2008 at 06:49:52AM +0800, jida...@jidanni.org wrote: > These however are more insidious, compare bash: > $ dash -c 'b=5; echo $((--b)); echo $((--b))' > 5 > 5
--b is being parsed here as a double-negation. > $ bash -c 'b=5; echo $((--b)); echo $((--b))' > 4 > 3 > $ dash -c 'b=5; echo $((++b)); echo $((++b))' > 5 > 5 Similarly, this is being parsed as a double unary-plus. POSIX says support for ++ and -- is "not required", but it doesn't seem to (explicitly or implicitly) indicate how an implementation may handle ++b and --b when they aren't supported: http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_04 Cheers, Olly -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
