Add Set, Get, And Unset Env Vars With Dokku as a Devops TIL

devops/set-get-and-unset-env-vars-with-dokku.md

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+# Set, Get, And Unset Env Vars With Dokku
+
+The `dokku` CLI provides `config` subcommands for managing environment variables
+for the target container.
+
+An env var can be set for an active container with `config:set`:
+
+```bash
+$ dokku config:set app-name JEMALLOC_ENABLED=true MALLOC_CONF="stats_print:true"
+```
+
+Notice I'm able to set multiple env vars at once if needed.
+
+If I ever need to check what an env var is currently set to for one of my app
+containers, I can use `config:get`:
+
+```bash
+$ dokku config:get app-name JEMALLOC_ENABLED
+true
+```
+
+I can always override any value with another `config:set`. However, if I need to
+entirely remove the env var, I can use `config:unset`:
+
+```bash
+$ dokku config:unset app-name MALLOC_CONF
+```
+
+[source](https://dokku.com/docs/configuration/environment-variables/)