[wdb] This command shows or extends the namespace
where an input command is searched in.

In this example, the namespace is extended:
======
% namespace path "tcl::mathfunc tcl::mathop"
% 
======

Now, you can input math-related commands as follows:
======
% hypot 3 [+ 2 2]
5.0
% 
======


In this example, the namespace extension is shown.
======
% namespace path
::tcl::mathfunc ::tcl::mathop
% 
======

Note that the namespaces argument is ''one proper list''.
It is not possible to input namespaces as single arguments.
(Is it a matter of discussion if that should be possible?)

Note that [namespace path] can be executed differently in different namespaces.
    :   ([DKF]: What does this paragraph mean? Please clarify.)

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