$ chown root:wheel /bin/rm
$ chmod 0550 /bin/rm
$ echo mv $* $HOME/.rmTrash/ >/usr/local/bin/rm.safe
$ chown root:users /usr/local/bin/rm.safe
$ chmod 0555 /usr/local/bin/rm.safe
$ for dir in /home/*; mkdir $dir/.rmTrash 
> echo alias rm=rm.safe >> $dir/.aliases ; done