trace step

Every line in the program as it is about to be executed 

trace next -in function

Every line while the program is in the function 

trace at line_number

The line number and the line itself, as that line becomes the next line to be executed 

trace in function

The name of the function that called function; line number, parameters passed in, and return value

trace inmember member_function

The name of the function that called member_function of any class; its line number, parameters passed in, and its return value

trace inclass class

The name of the function that called any member_function in class; its line number, parameters passed in, and return value

trace infunction function

The name of the function that called any member_function in class; its line number, parameters passed in, and return value

trace change variable [-in function]

The new value of variable, if it changes, and the line at which it changed