Re: here document within a switch fails to parse.

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

On 2021-01-08 7:53 a.m., Lawrence Velázquez wrote:
> On Jan 8, 2021, at 10:27 AM, Karsten Borgwaldt <kb@xxxxxxxxxx 
> <mailto:kb@xxxxxxxxxx>> 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.