From: Ray Andrews <rayandrews@eastlink.ca>
To: zsh-users@zsh.org
Subject: Re: here document within a switch fails to parse.
Date: Fri, 8 Jan 2021 09:13:44 -0800 [thread overview]
Message-ID: <fdff6650-85eb-fad5-a169-673d31c119fb@eastlink.ca> (raw)
In-Reply-To: <F26C7E43-7645-42AD-9737-6DADA049413C@larryv.me>
On 2021-01-08 7:53 a.m., Lawrence Velázquez wrote:
> On Jan 8, 2021, at 10:27 AM, Karsten Borgwaldt <kb@spambri.de
> <mailto:kb@spambri.de>> wrote:
>
>> Some expressions in heredocs will be evaluated. Not a good idea for
>> comments:
>>
>> :<<EOC
>> $(print something > /dev/stderr)
>> EOC
>
> Not if some or all of the delimiter specification is quoted (as Ray is
> doing, in response to a suggestion in an earlier thread):
>
> : <<\EOC
> $(print something > /dev/stderr)
> EOC
>
Good to know! But playing with the above:
function test1 ()
{
:<<EOC
$(print something from a function with dollarsign)
print something from a function redirected > /dev/stderr
$(print something from a function both > /dev/stderr) # This is
the only thing that prints.
print something from a function
COMMENT from a function
echo "echo from a function"
EOC
}
... not to belabor it, but why in heaven is just that one construction
evaluated? zsh always has a gotcha! waiting, but someone obviously went
to some trouble to sniff that out. Neither the '$' nor the redirection
is sufficient alone but they evaluate together. Why? I'd better read up
on what here documents are really for. And it isn't comments! But when
I want to quickly turn off a hundred lines of code, I succumb to the
temptation.
next prev parent reply other threads:[~2021-01-08 17:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-06 15:13 Ray Andrews
2021-01-06 16:20 ` Daniel Shahaf
2021-01-06 17:17 ` Ray Andrews
2021-01-06 17:58 ` Lawrence Velázquez
2021-01-06 19:18 ` Bart Schaefer
2021-01-07 7:55 ` Ray Andrews
2021-01-07 15:32 ` Daniel Shahaf
2021-01-07 20:16 ` Ray Andrews
2021-01-08 15:27 ` Karsten Borgwaldt
2021-01-08 15:53 ` Lawrence Velázquez
2021-01-08 17:13 ` Ray Andrews [this message]
2021-01-08 18:06 ` Peter Stephenson
2021-01-08 19:39 ` Ray Andrews
2021-01-08 19:56 ` Bart Schaefer
2021-01-09 0:45 ` Ray Andrews
2021-01-09 17:28 ` Ray Andrews
2021-01-12 13:28 ` Daniel Shahaf
2021-01-12 14:45 ` Ray Andrews
2021-01-13 16:17 ` Daniel Shahaf
2021-01-13 21:57 ` Pier Paolo Grassi
2021-01-13 23:39 ` Ray Andrews
2021-01-13 23:54 ` Lawrence Velázquez
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