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Depending on how you have installed ROS and particularly turtlesim package, the binaries may be in various places.

1. If ROS (including turtlesim, i.e. ROS Desktop Full option) is installed from deb-packages then it will be in /opt/ros/<ros_distro_name>/lib/turtlesim/
2. If from source (again, as Desktop Full), then it will be in install space, e.g. ~/ros_catkin_ws/install_isolated/lib/turtlesim/
3. Finally, if turtlesim is installed as a separated package from source, then the binaries could be either in your development space or install space (if you did catkin_make install), e.g. ~/catkin_ws/devel/lib/turtlesim/ or ~/catkin_ws/install/lib/turtlesim/

As for the source code of turtlesim_node, it is comprised of several source files. You can find the list of these files in package's CMakeLists.txt file. Similarly, you can find there build command for turtle_teleop_key.

Also turtlesim is a part of ros_tutorials metapackage (see this wiki page), so the package folder is actually nested in ros_tutorials/turtlesim.

Depending on how you have installed ROS and particularly turtlesim package, the binaries may be in various places.

1. If ROS (including turtlesim, i.e. ROS Desktop Full option) is installed from deb-packages then it will be in /opt/ros/<ros_distro_name>/lib/turtlesim/
2. If from source (again, as Desktop Full), then it will be in install space, e.g. ~/ros_catkin_ws/install_isolated/lib/turtlesim/
3. Finally, if turtlesim is installed as a separated package from source, then the binaries could be either in your development space or install space (if you did catkin_make install), e.g. ~/catkin_ws/devel/lib/turtlesim/ or ~/catkin_ws/install/lib/turtlesim/

As for the source code of turtlesim_node, it is comprised of several source files. You can find the list of these files in package's CMakeLists.txt file. Similarly, you can find there build command for turtle_teleop_key.

Also turtlesim is a part of ros_tutorials metapackage (see this wiki page), so the package folder is actually nested in ros_tutorials/turtlesim.