This is all about hacking around with a running Sling and just a curl on the command line. It concentrates on the default servlets in Sling that provide json representations of JCR nodes and properties and allow for POSTing with normal forms to update properties.

GETting a json representation:

• curl -s -u admin:admin http://localhost:8080/content/path/to/node.infinity.json

The "-s" means silent, ie. no download progress indicator displayed.

POSTing:

• single value property:
  curl -F "property=value" -u user:password http://localhost:8080/content/path/to/node

• multi value propery:
  curl -F "property=value1" -F "property=value2" -u user:password http://localhost:8080/content/path/to/node

Add parameter "-v" to see the HTTP headers in the console.