Read the list of files with readdir/File::Find and their sizes by -s (Dir::List seems to be able to do the job as well), compute the ratio. Alternatively, Filesys::DiskUsage may give you the total size.

In reply to Re: Copying a directory and its contents wihile displaying a progress bar by pjotrik
in thread Copying a directory and its contents wihile displaying a progress bar by bittis

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