to my knowledge these are design compiler commands and i've posted the descriptions of these commands. by write_test, if u mean generation of test patterns in dft_compiler, i'm not sure how these commands can be used there.
Also, for the list of variables which affect the write_test, please type write_test and press tab in ur dc shell prompt.
set_false_path means the path is exist,but we don't want to check it;
set_case_analysis will assign a constant value to a pin or port,and this value will will decide which arc(path) will be disabled!