Re: wrong behaviour when unsetting/setting some variables

[Christoph Anton Mitterer <calestyo@xxxxxxxxxxxx>]

On Wed, 2024-02-28 at 00:56 +0000, Harald van Dijk wrote:
> However, trying to fix this I come across a corner case where it is
> not 
> clear to me what the intended behaviour is.
> 
>    set -a; readonly foo=bar; export # some shells export, not all

As far as I can see, POSIX doesn't seem to be absolutely definite about
this, but personally I'd say the spirit of it is rather that set -a
generally applies, and so foo would be exported.

One might also argue like this:
* -a says "the export attribute shall be set for each variable to which
  an assignment is performed".
* readonly does assign at some point before it returns and at that
  point, the variable obviously cannot be readonly already.
  Only before it returns it's made readonly.

Since -a acts already at the assignment step, it the export is set
before the readonly.

But of course, that's also a lot of reading something into it ;-)


Cheers,
Chris.