Hello,
On Sun, Jun 24, 2018 at 05:11:34PM +0700, Robert Elz wrote:
> Hi all,
>
> I am soon going to add an ATF test for sh pattern matching (it tests all
> 3 forms, glob expansion, case patterns, and ${var#patern})
>
>[...]
>
> [97] var="[:alpha:]"; case "[" in (["$var"]) printf M;; (*) printf X;; esac
> [97] Expected output 'M', received 'X'
>
Can you explain why you expect success ("M") in this case? From my basic
understanding of how the shell processes, I expect:
- Substitution of the value of $var in (["$var"]) resulting in:
(["[:alpha:]"]);
- [Suppression of the double quotes? But this doesn't change anything in
the bracket expression];
- Then interpretation of the bracket expression.
But then "[" is not an alpha, so it correctly fails...
Could you explain why you think otherwise?
Best regards,
--
Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
http://www.kergis.com/
http://www.sbfa.fr/
Key fingerprint = 0FF7 E906 FBAF FE95 FD89 250D 52B1 AE95 6006 F40C
