fudge is shell script, so make sure it's added to your $PATH. Do this by editing /etc/paths, and adding the path containing fudge.
fudge is designed to automatically generate repetitious code. For example:
fudge generate model User NSString:first_name,last_name,user_id BOOL:is_authenticated*
will create a User.h and a User.m file in a model directory.
User.h will have the instance variables first_name, last_name, user_id of type NSString* and is_authenticated of type BOOL. It will also have proper property declarations.
User.m will have the synthesized properties, as well as [varName release] for the proper instance variables.