Since hidden files on a Unix platform simply start with a period, it is trivial to create one using Common Lisp. Hidden files on Windows machines are defined differently. They have a file attribute that indicates whether they are hidden. How can one create these type of files using Common Lisp? I'm using Allegro CL on Windows.
Creating a hidden file in Common Lisp
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The ANSI CL standard offers no such functionality. Your vendor might provide it though.
How about
file-hidden-p
:PS. Note that I have not used Allegro for over 15 years. The information above is from Google:
file-attributes
file-hidden-p
Still, as I said before - do not hesitate to ask ;-)