I'm assuming you're using File::Copy.

What are you trying? I can do the following (where both tmp.pl and tmp.log exist) with no problems: 
perl -MFile::Copy -le 'File::Copy::copy("tmp.log", "tmp.pl");'

[download]
Do you maybe not have write permissions?
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In reply to Re: overwrite a file by RazorbladeBidet
in thread overwrite a file by Anonymous Monk

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