Veni, Vidi, VISA

$ tree

.

|-- foo.bar

`-- jehova

    `-- foo.bar



1 directory, 2 files

$ mv --backup=numbered foo.bar jehova

$ tree

.

`-- jehova

    |-- foo.bar

    `-- foo.bar.~1~



1 directory, 2 files

if [ ${OS} = "linux-gnu" -n ${(MS)$(mv --version 2>/dev/null)#GNU} ]; then

  alias mv="mv --verbose --backup=numbered"

  alias cp="cp --verbose --backup=numbered"

fi

-P Overwrite regular files before deleting them. Files are over-
written three times, first with the byte pattern 0xff, then 0x00,
and then 0xff again, before they are deleted. Files with multi-
ple links will not be overwritten.