problems with backup script from man pages

Has anyone had problems with the  backup procedure suggested in the 
man procmailex pages? I try:


     #  :0 c
     #  Backup

     #  :0 ic
     #  | cd Backup && rm -f dummy `ls -t msg.* | sed -e 1,32d`

but the msg files are building up in mail/Backup and not being
removed. I get messages in .procmail/log about rm msg*
I wonder if it is because rm is aliased to rm -i?

::::::GREg Matheson Soonchunhyang U 
grr(_at_)bora(_dot_)dacom(_dot_)co(_dot_)kr::::::