Envsubst

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Overview

envsubst performs environment variable expansion in shell-format strings in arbitrary files, by replacing global variables with their values. No other shell command line expansions will be. performed. If a variable is declared but not found in the environment, it will be replaced with the empty string.

cat file.txt | envsubst > file-with-variables-expanded.txt

Installation

Mac

brew install gettext

then modify .bashrc:

 export PATH=/usr/local/opt/gettext/bin:${PATH}

RedHat/Centos

yum install -y gettext