env-template

Very simple command that reads a file, replaces placeholders with the contents of environment variables, and outputs to stdout.

This can help with, for example, creating a configuration file for use within Docker.

Install

For Linux x86_64, you can grab a release and place it anywhere, for example:

sudo curl -L -o /usr/local/bin/env-template \
    https://github.com/fazy/env-template/releases/download/0.1/env-template-0.1-linux-x86_64 \
&& sudo chmod 0755 /usr/local/bin/env-template

For other systems you can clone this repository, download Go and build with one command.

Usage

This program takes one argument, the name of your template file, and always outputs the result to stdout:

env-template <templatefile>

For example:

env-template config.yml.tpl > config.yml

Template file

The template file is based on Go Template, with all the variables from your external environment already set.

Here's a simple exmaple:

test.yml

User: {{ env "USER" }}
Path: {{ env "PATH" }}