15ccf5eb_TestNG_Command_Line_Parameters_Documentation
[Option] -reporter [Argument] The extended configuration for a custom report listener. [Documentation] 
Similar to the -listener option, except that it allows the configuration of JavaBeans-style properties on the reporter instance. Example: -reporter com.test.MyReporter:methodFilter=*insert*,enableFiltering=true You can have as many occurences of this option, one for each reporter that needs to be added.
TestNG
Documentation