On Thu, 11 Apr 2024 15:07:14 +1200 Martin D Kealey <mar...@kurahaupo.gen.nz> wrote:
> I can confirm that this changed between 4.4.23(49)-release and > 5.0.0(1)-beta, which coincides with the parser being largely rewritten. > > On Thu, 11 Apr 2024 at 12:51, <nbow...@draconx.ca> wrote: > > > The POSIX shell grammar specifies that a newline may optionally appear > > before the in keyword of a for loop. > > > I don't see that at §2.9.4 "The for Loop" ( > https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_04_03) > and I've never seen it in the wild. > > But ... oh look, it's mentioned in §2.10.2 ( > https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_10_02 > ). > > I wonder when that was added, and why? I checked as far back as Issue 4 Version 2 (1994), which supports it. Specifically, it specifies the following two forms: - for name linebreak do_group - for name linebreak in wordlist sequential_sep do_group Issue 6 additionally specifies the following form: - for name linebreak in sequential_sep do_group As a consequence of https://austingroupbugs.net/view.php?id=581, Issue 7 additionally specifies the following form: - for name sequential_sep do_group Note that "linebreak" implies either a "newline_list" or nothing at all. With that in mind, here are some examples. for var do :; done for var in 1; do :; done for var in; do :; done for var; do :; done -- Kerin Millar
