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I'm not 100% sure if this is your question, but I'll give it a go.
roscd <packagename>
is used to move into a package. You cannot use it to move to arbitrary directories within your workspace. E.g. roscd src
would end up with multiple conflicting directories.
You can however pass in directories relative to a package. So e.g. roscd move_base/src
would work.
For more info, have a look at the documentation.