21 Jun
2021
21 Jun
'21
8:48 p.m.
On 6/21/21 10:43 AM, Michael Siegel wrote:
Am Mon, 21 Jun 2021 09:50:38 -0400
schrieb Chet Ramey <chet.ramey(a)case.edu>:
From the first published version of the standard, yes.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet(a)case.edu http://tiswww.cwru.edu/~chet/
The $((...)) form of arithmetic expansion is
something POSIX picked up
from ksh-88, eventually. The early drafts of the standard (through
1003.2 d9, at least), used $[...], but they eventually adopted
$((...)) because ksh-88 had already implemented it, though it's not
documented in Bolsky and Korn.
So, in other words, POSIX shell (meaning the shell described in the
standard as it has been released) had double-parentheses arithmetic
evaluation from the start?