On Mon, 20 Jul 2020 11:52:48 +0200
"R.Wieser"  wrote:

> > It might also contain spaces, tabs, newlines etc.
>
> Yeah, that was something I didn't think about ...

 The root cause of 99.9% of all software problems right there.

> And yes, wrapping the environment variable into double quotes does seem
> to do the trick.

 It is also standard best practice for shell programming and has
been for decades.

>   Even though my tests in that direction initially
> failed - because I removed the spaces at both sides of the "=".   Didn't
> realise BASH needs them.

 It's nothing to do with bash, and everything to do with /bin/test
aka /bin/[.

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