Tutorial gives Quick Overview of Filesystem Concepts
Packages: Packages are the lowest level of ROS software organization. They can contain anything: libraries, tools, executables, etc.
Manifest: A manifest is a description of a package. Its most important role is to define dependencies between packages.
Stacks: Stacks are collections of packages that form a higher-level library.
Stack Manifest: These are just like normal manifests, but for stacks.
I quickly tried
$ rospack find roscpp
As per tutorial I tried
$ roscd roscpp
$ roscd roscpp/include
This tutorial mentions about few environment variables
$ echo $ROS_PACKAGE_PATH
$ echo $ROS_ROOT
$ rosls roscpp_tutorials
add_two_ints_client listener listener_with_userdata srv
add_two_ints_server listener_async_spin Makefile srv_gen
add_two_ints_server_class listener_class manifest.xml talker
anonymous_listener listener_multiple node_handle_namespaces time_api
babbler listener_single_message notify_connect timers
bin listener_threaded_spin parameters
CMakeLists.txt listener_unreliable ROS_NOBUILD
custom_callback_processing listener_with_tracked_object src
I also tried Tab Completion, which works well
To conclude, following ROS tools are covered in ROS tutorial
rospack = ros + pack(age)
rosstack = ros + stack
roscd = ros + cd
rosls = ros + ls