I agree with previous orator. In case you need your own wheel, let's examine provided code.

• First of all, you need to check for directory _before_ matching against /.nsf/. Is it safe to assume file before actual check?
• Second, I personally dislike the idea to change directory using chdir twice. You can work indtead with full path filenames.

right now I have no time, sorry, but I can give a link to similar code sample.

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