Create a file ~/.flickcurl.conf with the two values above (API Key, Shared Secret) like this:

[flickr]
api_key=0123456789abcdef0123456789abcdef
secret=fedcba9876543210

Then visit the Authentication URL mentioned in the previous section (http://www.flickr.com/auth-11111111111111111) in a web browser.

Flickr will return a page that says something like:

  "[APP NAME] wants to link to your Flickr account"

with more information and two buttons. Click the button with the text:

  [OK, I'LL AUTHORIZE IT]

Flickr App Garden - Mobile Auth

Flickr will return on the next page a 9-digit FROB that looks like this:

  123-456-789

Switch back to the command line and run the flickcurl utility with that FROB:

$ flickcurl -a 123-456-789

The result will be that an Authentication Token (auth token) is calculated and returned. The flickcurl utility will reply:

flickcurl: Successfully exchanged frob 836-328-145 for authentication token
flickcurl: Updated configuration file /Users/NAME/.flickcurl.conf with authentication token

The flickcurl utility has automatically updated the ~/.flickcurl.conf configuration file (as the message will show) with the auth_token field to give something like:

$ cat ~/.flickcurl.conf
[flickr]
auth_token=1234567-8901234567890123
api_key=0123456789abcdef0123456789abcdef
secret=fedcba9876543210

At this stage, the utility (or library) is authenticated and ready to use.