Another Linux newbie note: To apply the latest security patch via shell (or PHP Shell), use
wget to download the patch file to the root of the drupal installation:
wgat
http://drupal.org/files/sa-2006-008/4.7.1.patch
Then use the Linux patch command to apply the patch using the -p0 switch to use relative paths (or something like that).
wgat -p0 <4.7.1.patch