> From: Kerin Millar <k...@plushkava.net>
> To: Dennis Williamson <dennistwilliam...@gmail.com>
> Subject: Re: parameter expansion with `:` does not work
> Date: 08/07/2021 03:51:15 Europe/Paris
> Cc: lisa-as...@perso.be;
> Greg Wooledge <g...@wooledge.org>;
> bug-bash <bug-bash@gnu.org>;
> Chester Ramey <chet.ra...@case.edu>
> On Thu, 8 Jul 2021 02:54:06 +0200 (CEST)
> lisa-as...@perso.be wrote:
> > As I was in it, have also changed
> >
> > fdir=${fdir:-$PWD}
> This makes sense.
> It makes sense, although one is using substitution and then setting it to the
> same parameter.
> > to
> >
> > fdir=${fdir:=$PWD}
> Here, you are using a form of parameter expansion that intrinsically performs
> variable
> assignment, only to redundantly assign the result of the expansion to the
> same variable once
> again.
Correct. How do others customarily use `${fdir:=$PWD}` ?
> In a roundabout fashion, it ends up proving Greg's point. I'd suggest
> temporarily disavowing
> yourself of the ${parameter:=word} form, for the time being.
I'd rather understand what's going on, rather than simply never use it.
