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Logger allows programmer to control the verbosity of the print statements, with change of verbosity level in configuration file, obviously without recompiling the code. As you have read in the Overview page, ROS logger support different versions. By changing the verbosity level in the configuration file, one can control what will get printed on the system console. Please read section 2 of rosconsole page for further details. Also rqt_console, allow much better control over print statements and display of them.