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write

echo 'export ROS_PACKAGE_PATH="$ROS_PACKAGE_PATH:$HOME/ros_workspace"' >> ~/.bashrc

then run .bashrc in your shell

I assume that your system is ubuntu and you are using bash shell

write

echo 'export ROS_PACKAGE_PATH="$ROS_PACKAGE_PATH:$HOME/ros_workspace"' >> ~/.bashrc

then run .bashrc in your shell

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