New feature in mv

[Paweł Lampe]

Hi there !

Few minutes ago, my mate asked me 'is there any way to swap two
files ?'. I have realized, that the mv has option -S but it's all about
suffix. I think, there should be also -s for swapping. It should work
like:
mv -s a b
Effect should be like:
a -> tmp
b -> a
tmp -> b

Think about it