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compiled 'ros' files generate normal binaries in the case of cpp for example. You will be able to see these binaries in the bin folder . You can execute them just like normal binaries with ./binary_file but you have to be in the bin folder. The ros utilities like rosrun and roslaunch relieve you of the burden of moving between folder just to execute binaries.

Also I dont know what you mean by "g++ openni_tracker.cpp", but if you mean compiling a cpp file, you can use the Make fiel generated in the package, or more conveniently use rosmake.

compiled 'ros' files generate normal binaries in the case of cpp for example. You will be able to see these binaries in the bin folder . You can execute them just like normal binaries with ./binary_file but you have to be in the bin folder. The ros utilities like rosrun and roslaunch relieve you of the burden of moving between folder just to execute binaries.

Also I dont know what you mean by "g++ openni_tracker.cpp", but if you mean compiling a cpp file, you can use the Make fiel file generated in the package, or more conveniently use rosmake.