don't clear each time

git-svn-id: https://svn.sixfeetup.com/svn/private/claytron/dotfiles/trunk@45168 7abc7aa1-7e52-db11-9331-00508bd72530
option to set the prefix

git-svn-id: https://svn.sixfeetup.com/svn/private/claytron/dotfiles/trunk@45169 7abc7aa1-7e52-db11-9331-00508bd72530