how to update ROS_PACKAGE_PATH ?

edit

Use this syntax on the command line:

export ROS_PACKAGE_PATH=~/ros_workspace:/opt/ros/electric/stacks

Replace "~/ros_workspace:/opt/ros/electric/stacks" with the desired package path.

Use:

rosws set ~/fuerte_workspace/package_name

where in your case package_name is farshid. To know what's your fuerte_workspace use:

echo $ROS_WORKSPACE

I prefer just edit ~/.bashrc file to set ROS_PACKAGE_PATH. After edit that file,remember to restart terminal or create new one.