Bash Shell Parameter Expansion

[tolugboji]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Saturday, October 9th, 2021 at 11:35 PM, Lawrence Velázquez <vq@larryv.me> 
wrote:

> On Sat, Oct 9, 2021, at 6:58 PM, tolugboji wrote:
>
> > Some bash implementations
>
> There is only one bash implementation. Presumably you're referring
>
> to Bourne-derived shell languages in general.
>
> > mention ${PARAMETER-WORD} and ${PARAMETER+WORD}. But these are
> >
> > not mentioned in the gnu bash manual?
>
> As Greg already pointed out, they are in fact mentioned in the
>
> manual, although it's admittedly easy to overlook.

Yes, because most times one quickly looks at the parameter listings
in bold, rather than reading through all the text.  It would be good
if they are added like is done here

https://wiki.bash-hackers.org/syntax/pe

> > Is this because they are not implemented in gnu bash?
>
> GNU bash is the only bash.

> -----------------------------
>
> vq