envsubst – Substitute Variables for Environment Variables
Hi 👋, Introduction In this short article I want to showcase a nice and useful Linux command. The comand 🥁 envsubst 🥁. In short it Substitutes the values of environment variables. It’s great for populating configuration files with values from environment variables, a common operation for developers containerizing their applications. Example Usecase Let’s say we are containerizing an application and we have the following file configuration.yaml, and we want to modify the values of the environment field and the log_level field without adding the additional complexity of mounting the configuration.yaml file into the container/pod. ...