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envsubst

Substitutes environment variables with their value in shell format strings.
Variables to be replaced should be in either `${var}` or `$var` format.

More information.

echo '{$HOME}' | envsubst
envsubst < {path/to/input_file}
envsubst < {path/to/input_file} > {path/to/output_file}
envsubst '{$USER $SHELL $HOME}' < {path/to/input_file}
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