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Re: select syntax violates the POLA

From: Greywolf
Subject: Re: select syntax violates the POLA
Date: Mon, 5 Apr 2021 01:56:33 -0700
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.0

On 4/4/2021 23:13, konsolebox wrote:
On Sat, Apr 3, 2021 at 1:09 AM Robert Elz <kre@munnari.oz.au> wrote:
   |  [[ ]] and (( )) are a form of reserved words themselves

Those are bash specials, and I am fairly sure that (( and )) will be
operators, not reserved words (they cannot really be the latter, as ( and
) are operators) and I suspect that [[ and ]] might be as well, but there
I'm not sure.   operators and reserved words are quite different things.
Operators (unquoted) are recognised as themselves wherever they appear.

Stop suspecting and read the source code.  Look at parse.y starting at
line 2150.  They are labeled as "Reserved words".

[[ and ]] behave like reserved words requiring whitespace between
themselves and their operands.  (( and )) do not carry that restriction;
within (( )), neither do any of */%^&|+- (or their respective OP=),
nor == || && !.  This effectively classifies (( )) as operators.

But we've drifted considerably afield.


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