;Task:
Rename:
:::*   a file called     '''input.txt'''     into     '''output.txt'''     and
:::*   a directory called     '''docs'''     into     '''mydocs'''.


This should be done twice:  
once "here", i.e. in the current working directory and once in the filesystem root.

It can be assumed that the user has the rights to do so.

(In unix-type systems, only the user root would have
sufficient permissions in the filesystem root.)
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