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From: =?utf-8?Q?Lawrence_Vel=C3=A1zquez?= <vq@larryv.me>
Newsgroups: gnu.bash.bug
Subject: Re: Undocumented for-loop construct
Date: Thu, 6 Aug 2020 22:42:48 -0400
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Cc: Klaas Vantournhout <klaas.vantournhout@gmail.com>, bug-bash@gnu.org
To: "Dale R. Worley" <worley@alum.mit.edu>
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> On Aug 6, 2020, at 10:29 PM, Dale R. Worley <worley@alum.mit.edu> =
wrote:
>=20
> Klaas Vantournhout <klaas.vantournhout@gmail.com> writes:
>> Recently I came across a surprising undocumented bash-feature
>>=20
>>   $ for i in 1 2 3; { echo $i; };
>>=20
>> The usage of curly-braces instead of the well-documented do ... done
>> construct was a complete surprise to me and even lead me to open the
>> following question on stack overflow:
>=20
> Interesting!  Looking at parse.y, it looks like do ... done can be
> replaced with { ... } in 'for' and 'select' statements, but not =
'while'
> and 'until' statements.  Not clear why that would be

Unless I'm quite mistaken, our very own O=C4=9Fuz left the only answer
on the OP's Stack Overflow question, explaining that braced forms
of the other compound commands would be syntactically ambiguous.

https://stackoverflow.com/a/63261064

vq=