Environment Variables

printenv - check current env variables.

printenv USER - get a specific env var.

Env vars can be used in script files like: $USER.

We can create user-specific env vars in ./bashrc file in user home directory.

export DB_PASSWORD=dbpwd
export DB_USER=dbusr
export DB_NAME=mydb

To apply changes we should restart terminal. Or we can run: source ~/.bashrc - load new env vars into the current shell session.

System-level env variables should be stored in /etc/environment.

PATH Environment Variable

• List of directories to executable files, separated by :.

• Tells the shell which directories to search for the executable in response to our executed command.