[ruby-core:51749] Re: [ruby-trunk - Feature #7751] How to encapsulate File.delete and File.rename into one 'transaction'?

> What a great function! I've confirm it is true.
>
> irb(main):001:0> File.write('src', '000')
> => 3
> irb(main):002:0> File.write('dest', '1111')
> => 4
> irb(main):003:0> File.rename('src', 'dest')
> => 0
> irb(main):004:0> File.read('dest')
> => "000"
>
> It is sorry that the doc of Ruby (Ruby19.chm) didn't describe it:
>
> rename(old_name, new_name)
> Renames the given file to the new name. Raises a SystemCallError if the file cannot be renamed.
>
>    File.rename("afile", "afile.bak")   #=> 0

Because all File method behaviors depend on OS. It is not a part of
ruby responsibility.