in reply to (OT) Is there any difference "link" and "copy" functions

Did you actually read the docs?

On *ix, a link is a pointer to another file. Sort of like shortcuts in Windows (although better); copy (amended link) duplicates the contents of a file in a new file. Creating a link tells the directory that 'any time I refer to a file named fred, I really mean the file named Dr J Fred Mbogo.'

As an analogy, which may be best understood by US residents. The White House and 1600 Pennsylvania Avenue, Washington, DC refer to the place, by different names.

emc

At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.

—Igor Sikorsky, reported in AOPA Pilot magazine February 2003.
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