On 20/07/2020 14:44, Ahem A Rivet's Shot wrote:
>> 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.

Another solution, not decades old, is to use double brackets [[ which is
a keyword, not a built-in like [ or test, and within which Bash does not
split words. Also allows ==,&&,etc. which are probably clearer to
programmers not living in Bash. This prints yes:

t='a b'; if [[ $t == 'a b' ]]; then echo yes; else echo no; fi

(but I would still use double quotes "$t" every time...)

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