Add Tell direnv To Load The Env File as a Unix TIL

unix/tell-direnv-to-load-the-env-file.md

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+# Tell direnv To Load The Env File
+
+By default [`direnv`](https://direnv.net/) looks for and evaluates the `.envrc`
+file that appears in a given project directory. This default behavior is good
+for things like setting certain path dependencies (e.g. a specific version of
+node or postgres).
+
+To the end of using `direnv` to set up the development environment, it can be
+useful to have it also load the `.env` file into the current shell's
+environment.
+
+To get `direnv` to do that, add this line to the `.envrc` file:
+
+```
+dotenv_if_exists .env
+```
+
+This specific loads all the environment variables in `.env`. If there are other
+files, such as `.env.development` that need to be loaded in, those can be
+included with additional
+[`dotenv_if_exists`](https://direnv.net/man/direnv-stdlib.1.html#codedotenvifexists-ltdotenvpathgtcode)
+declarations.