On Tue, Jan 12, 2016 at 11:52:47AM -0800, Linda Walsh wrote: > Also, from a documentation standpoint, not all behaviors are documented > in the manpage, like: > > echo $[1+2] > > as far as I can tell, isn't documented, yet not supporting > its behavior would break many older scripts....
That syntax has been deprecated for at least 15 years. Nobody is supposed to be using it. It's undocumented ON PURPOSE, to try to make people stop doing it. If you have older scripts that use it, fix them now.
