env

List all environment variables

env lists all environment variables set in the shell. Environment variables control application behavior: DATABASE_URL, PORT, API_KEY, NODE_ENV.

Example

$ env | grep -E '^(HOME|USER|PATH)='
HOME=/home/ubuntu
USER=ubuntu
PATH=/usr/local/bin:/usr/bin:/bin

Tip: Type it yourself in the terminal below - reading is not the same as doing.