[bug #63948] envsubst: Support option -s for "strict"

[Thomas Güttler]

Follow-up Comment #2, bug #63948 (project gettext):


[comment #0 original submission:]
> It would be nice, if envsubst would support the `-s` (strict) option. This
option makes the command fail, if a variable is not existing in the list of
environment variables.
> 
> Related tools support this. For example: 
> 
> https://github.com/kreuzwerker/envplate
> 
> 

envplate does not support fallbacks like `${missing=default}`. 

If someone is here looking for an envsubst tool which supports fallbacks and
fail-on-missing, then this tools looks good:

https://github.com/a8m/envsubst



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