Some problems about the ROS path

edit

Hi,

My ROS has been installed at /opt/ros/cturtles

/opt/ros/cturtle$ ls

it shows: jason ros setup.bash setup.sh setup.zsh stacks

where the file of "jason" which I create, is to be contained myself packages.

Question1, could i create this file for including myself packages? I mean could i create this file under "cturtles" file, or "ros" file , or "stacks" file?

Question2,I create a package with 'roscreate-pkg', then I update my ros path.and the command is :

$ export ROS_PACKAGE_PATH=/opt/ros/cturtle/jason/:$ROS_PACKAGE_PATH

and then

$ rospack find ros_opencv   %ros_opencv is what i have created

but it shows [rospack] warning: trailing slash found in ROS_PACKAGE_PATH /opt/ros/cturtle/jason/ros_opencv

at the terminal, and the next time,I input the command

$ rospack find ros_opencv

it shows :[rospack] couldn't find package [ros_opencv] why?

Best regards