I have a question in addition to this ons: questionhttp://cooking.stackexchange.com/questions/89/what-can-i-do-to-help-my-avocados-ripen

There are all kind of ways to make a avocado ripe faster. I actually want to know if there are ways to let fruit (and vegetables) in general ripen faster, or is it different for every kind of fruit/vegetable? And if there is some general way, can you provide it to me? 

Thank you a lot in advanced!