On Mon, Feb 10, 2025, at 1:05 PM, Andreas Schwab wrote: > On Feb 10 2025, Greg Wooledge wrote: > >> No, I've shown that it *is* working in older versions of bash, and I'm >> asking *why*. > > Does it? If it did, it should have printed -23, not -19.
Yeah, it doesn't work. The pattern ?([-+]) matches any character
followed by either a - or + in parentheses, so the substitution
doesn't actually replace anything, and -023 is treated as octal.
bash-3.2$ echo "$(( -023 ))"
-19
--
vq
