It's not documented explicitly because it's a standard practice for (Unix) command-line apps. Text should always be printed to STDOUT, so it can be piped into other programs (grep etc.) or redirected to files (>) and much more.
That whole magic is implemented in the shell (console) executing cb2util, and is nothing cb2util does itself.
That whole magic is implemented in the shell (console) executing cb2util, and is nothing cb2util does itself.

Comment