Re: Why can redirection be combined in an assignment statement?

[Andreas Kusalananda Kähäri]

On Mon, May 10, 2021 at 11:16:59AM -0500, Peng Yu wrote:
> >         $ reverse=false; if "$reverse"; then a=$(rev); else a=$(cat); fi 
> > <<<"hello"; echo "$a"
> >         hello
> >         $ reverse=true; if "$reverse"; then a=$(rev); else a=$(cat); fi 
> > <<<"hello"; echo "$a"
> >         olleh
> 
> I am talking about combining just assignment and redirection, which
> comes from these rules.
> 
> simple_command_element: WORD
> | ASSIGNMENT_WORD
> | redirection
> ;
> 
> simple_command: simple_command_element
> | simple_command simple_command_element
> ;
> 
> Your example is not about this case. Therefore, it does not serve the
> purpose of justifying combining assignment and redirection.

Hm...  I think that

        a=$(cat) <<<"hello"

is exactly this.  You may replace <<<"hello" by <somefile if you wish.


-- 
Andreas (Kusalananda) Kähäri
SciLifeLab, NBIS, ICM
Uppsala University, Sweden

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