title: How to add a new element to a JSON file from a shell script
body: <p>I have the below JSON file test.json</p>
  
  <pre><code>{
              "run_list": ["recipe[cookbook-ics-op::setup_server]"],
              "props": {
                  "install_home": "/inst1",
                               "tmp_dir": "/inst1/tmp",
                  "user": "rven"
                  }
  }
  </code></pre>
  
  <p>From a shell script, I have to add 2 more properties under props. I don't want to read the existing contents first &amp; then add to it. Can anyone help with how I can do this?</p>