File.link(old_name, new_name) รข 0
Class Public methods
Creates a new name for an existing file using a hard link. Will not
overwrite new_name if it already exists (raising a subclass of
SystemCallError). Not available on all platforms.
File.link("testfile", ".testfile") #=> 0
IO.readlines(".testfile")[0] #=> "This is line one\n"
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