What is syntax to copy only new files?

[Nathan England]

> What is the syntax to copy only new files from a CD backup to a hard disk?
>
> I make backups of my files onto CDs and copy them onto another computer
> to maintain redunancy.  Probably there is a better way to do this (sync,
> etc.)
> so I would also appreciate knowing what is a better way to do this.
>
> What I have been using is this:
>
> cp -rp /mnt/cdrom/foldername /home/joe/foldername <E>
>
> That works, but I don't want to re-write files that are unchanged,
> and I don't want to write over any files that are newer on the
> destination system.  How should this syntax be changed?
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cp -u

-u is used for only updating files and writing new ones. It will not
overwrite anything unless a file is newer. I use rsync for this, but I
also use 'cp -ruv /somewhere /somewhere'

nathan