If you ever need to load a bunch of env vars into an environment it is easily
accomplished by having them listed in a .env file e.g.
# .env
API_KEY=secret
export USERNAME=squirrel
If all of the env vars are preceded with export the file can simply be
sourced with source .env. However, if any of the env vars are not preceded
with export there is an option that can be set prior to sourcing the file to
achieve the same result. Running
set -a; source .env; set +a
will load all env vars listed and then turn off the option of exporting all defined variables.