Backup data during mv command

@laks wrote:

lets say we have empty directory 'i'
$ ls i

We want to move a file named 'a' into that directory.

$ mv a i/

Simple so far. later sometime, a new file created with same name 'a'.

$ touch a

We want to ensure, that if the target directory already contains similar filename,
instead of overwriting, we want to backup old file and create this new file.
mv has an option '--backup' to do that.

$ mv --backup="numbered" a i/

$ touch a
$ mv --backup="numbered" a i/

Can you guess the expected result? its

$ ls i
a  a.~1~  a.~2~

It works at directory level too:

mkdir j 
touch j/{a,b,c}
mv --backup="numbered" j/* i
touch j/{a,b,c}
mv --backup="numbered" j/* i

Finally the directory looks like

$ls i
a  a.~1~  a.~2~  a.~3~  a.~4~  b  b.~1~  c  c.~1~

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