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 blue buttons. Locate the one below the text:

 If you arrived at this page because you specifically asked  to connect
 to your Flickr account, click here:

  [NEXT]

Click that button and on the next page click the blue button

  [OK, I'LL AUTHORIZE IT]

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

and the result will be that an Authentication Token (auth token) is calculated and returned.

The flickcurl utility will automatically update the ~/.flickcurl.conf configuration file with the auth_token field to give something like:

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