ROS learning -5 how function packs with the same name work (workspace coverage)

If you have a lot of workspaces and feature packs , Nodes with the same name may affect each other

Workspace has a,b,c

Under each workspace there is hello Function pack , that , Which workspace is the function package ？

[email protected]:~$ env | grep ros
LD_LIBRARY_PATH=/home/xrh/ROStest/devel/lib:/home/xrh/testmoveit/devel/lib:/opt/ros/melodic/lib
ROS_ETC_DIR=/opt/ros/melodic/etc/ros
CMAKE_PREFIX_PATH=/home/xrh/ROStest/devel:/home/xrh/testmoveit/devel:/opt/ros/melodic
ROS_ROOT=/opt/ros/melodic/share/ros
PYTHONPATH=/opt/ros/melodic/lib/python2.7/dist-packages
ROS_PACKAGE_PATH=/home/xrh/ROStest/src:/home/xrh/testmoveit/src/beginner_tutorials:/home/xrh/testmoveit/src/moveit_tutorials:/home/xrh/testmoveit/src/panda_moveit_config:/opt/ros/melodic/share
PATH=/opt/ros/melodic/bin:/usr/lib/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
PKG_CONFIG_PATH=/home/xrh/ROStest/devel/lib/pkgconfig:/home/xrh/testmoveit/devel/lib/pkgconfig:/opt/ros/melodic/lib/pkgconfig
[email protected]:~$ 

env You can see the environment variables of the whole system

Use grep You can just watch and ROS dependent .

Most in need of attention ROS_PACKAGE_PATH=

After running a feature pack , The system will ROS_PACKAGE_PATH= Start , Look backward in turn , When you find a node, use it , If you don't find it, look back . If more than one workspace has a feature pack with the same name , Once you find it, you won't look back