title: Store and access password using Apache airflow
body: <p>We are using Airflow as a scheduler. I want to invoke a simple bash operator in a DAG. The bash script needs a password as an argument to do further processing.</p>
  <p>How can I store a password securely in Airflow (<code>config/variables/connection</code>) and access it in dag definition file?</p>
  <p>I am new to Airflow and Python so a code snippet will be appreciated.</p>