scp don't overwrite, add nuimber code example

Example: scp skip existing files

find . -type f -exec chmod a-w '{}' \;

before running scp (it will complain and skip the existing files).
And change them back afterward ( chmod +w to get umask based value). If the files do not all have write permission according to your umask, you would somehow have to store the permissions so that you can restore them.