Let's walk through the steps of creating the app we've been working on above in a real world environment.
If you have not already done so, download and unpack the Ext JS framework from either the Products section of the main Sencha website (www.sencha.com) or from the downloads section of the Sencha Support portal.
You can download from Github by clicking the green "Clone or Download" button. Then just click "Download Zip" and save the file to your machine.
Once downloaded, move the folder to wherever you'd like your application to live.
Once you have your application where you want it, "cd" into its directory in your Command Line Interface (CLI). Then, issue the following command:
sencha app install --framework=/path/to/extjs/
This command will update your folder with Sencha Cmd's application scaffold that allows your application to benefit from Sencha Cmd's many features.
Note: "/path/to/extjs/" should be replaced with the path to wherever you unzipped the Ext JS framework on your machine.
Finally, run the following command to build the application:
sencha app build
You can now visit your application at its local address on your web server.
Alternatively, you can run this command so that Sencha Cmd will provide a web server for you:
sencha app watch
You can now visit the resulting address displayed in your console. It will usually be found here:
http://localhost:1841/