Envsubst: Difference between revisions
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=Overview= | =Overview= | ||
<tt>envsubst</tt> performs [[ | <tt>envsubst</tt> performs [[bash Parameters and Variables#Variable_Expansion_in_an_Arbitrary_File|environment variable expansion]] in shell-format strings in arbitrary files. No other shell [[Bash Command Line Expansion#Overview|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 | cat file.txt | envsubst > file-with-variables-expanded.txt | ||
Revision as of 19:55, 18 September 2019
Internal
Overview
envsubst performs environment variable expansion in shell-format strings in arbitrary files. 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