comp : compare files or directories, including metadata ( https://github.com/vaeth/comp/ )
diffhelp : A frontend, beautifier, and path-fixer for diff -u ( https://github.com/vaeth/diffhelp/ )
mv_perl : A collection of perl scripts (replacement in files, syncing dirs etc) ( https://github.com/vaeth/mv_perl/ )
pyrep : Search and/or replace regular expressions within many files interactively ( https://github.com/vaeth/pyrep/ )
replacer : Search and replace python regular expressions within many files interactively ( https://github.com/vaeth/replacer/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a mv
For Paludis use this rsync : rsync://gentoo.zugaina.org/mv-portage
If you have a problem : ycarus(-at-)zugaina.org