http://www.fmi.uni-passau.de/archive/doc/unix/unixhelp/Unixhelp/warnings_cat.html (Einblicke ins Internet, 10/1995)Do not use the name of a file that already exists. If you do, it will be overwritten by the new copy.\D'JOf@.'
Set the shell variable "noclobber" so that existing files cannot be overwritten (or clobbered).