Saving To Directories Question....

The below ".procmailrc" recipe [modified from the "procmailex" manual
entry] seems to work as intended, I was wondering if anyone could
think of anything that cause problems with the below recipe?  Or
something that I may have overlooked....

:0
* ^From(_dot_)*kevin(_at_)efn\(_dot_)org
{
   :0
   * ^To(_dot_)*kevin(_at_)efn\(_dot_)org
   {
      :0 c:
      test

      :0 i
      | cd $HOME/mail/test && rm -f dummy `ls -t msg.* | sed -e 1,3d`
   }
}