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4. Ignore Unset Variable Errors

With these files present in your working directory:

cillum_eu.properties

OCCAECAT=mollit dolor anim
DESERUNT=
CUPIDATAT

irure_quis.txt

OCCAECAT's value is: ${OCCAECAT}; whereas DESERUNT is empty: "${DESERUNT}".
Since CUPIDATAT is declared but not assigned in cillum_eu.properties, and given that the --ignore-unset-vars flag is enabled, this variable won't be replaced: ${CUPIDATAT}.
Same thing for INCIDIDUNT, which is not even declared at all: ${INCIDIDUNT}.

When the following command is executed:

$ dotenv-subst --ignore-unset-vars --env-file=cillum_eu.properties irure_quis.txt

The interpolated output is written to the file(s) below:

irure_quis.txt

OCCAECAT's value is: mollit dolor anim; whereas DESERUNT is empty: "".
Since CUPIDATAT is declared but not assigned in cillum_eu.properties, and given that the --ignore-unset-vars flag is enabled, this variable won't be replaced: ${CUPIDATAT}.
Same thing for INCIDIDUNT, which is not even declared at all: ${INCIDIDUNT}.

🔍 Further Reading

• Check out the supported syntax for defining interpolation variables in your source files.

• All available command options and flags are documented in CLI Options Reference.