To use the OpenWhisk CLI (Command Line Interface), follow these steps.
Set your OpenWhisk Namespace and Authorization Key. These are your settings. Copy and paste this line into your terminal.

**IMPORTANT NOTICE** OpenWhisk assigns a unique authentication key to each OpenWhisk namespace. This key will change as you switch your org or space in Bluemix so you must rerun this command.

This will target OpenWhisk in the US South region.

Please log in to see your credentials
Verify your setup. Here, we perform a blocking (synchronous) invocation of echo, passing it "hello" as an argument.
wsk action invoke /whisk.system/utils/echo -p message hello --result
{ "message": "hello" }
For more detail, consult the online OpenWhisk documentation.