How to print console log at jetson TX1 R28.2?

How to print console log at jetson TX1 R28.2?
I use the "dev_info"function,but i can not get the first parameter.How can set it?
maybe have the another function?

hello sensor_test,

may I have more details about your question.
would you like to add extra debug prints or you would like to see the prints from dev_info.
thanks