Skip download if files already exist in wget

You have to pass the -np/--no-parent option to wget (in addition to -r/--recursive, of course), otherwise it will follow the link in the directory index on my site to the parent directory. So the command would look like this:

wget --recursive --no-parent http://example.com/configs/.vim/

To avoid downloading the auto-generated index.html files, use the -R/--reject option:

wget -r -np -R "index.html*" http://example.com/configs/.vim/

From the manual page:

-P prefix
--directory-prefix=prefix
           Set directory prefix to prefix.  The directory prefix is the
           directory where all other files and sub-directories will be
           saved to, i.e. the top of the retrieval tree.  The default
           is . (the current directory).

So you need to add -P /tmp/cron_test/ (short form) or --directory-prefix=/tmp/cron_test/ (long form) to your command. Also note that if the directory does not exist it will get created.