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

From: Thomas Güttler
Subject: [bug #63948] envsubst: Support option -s for "strict"
Date: Tue, 21 Mar 2023 04:55:54 -0400 (EDT)

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:



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