Issue title: Where to find mmv, mcp ...?
 Issue body: http://manpages.ubuntu.com/manpages/bionic/man1/mmv.1.html
https://cygwin.com/packages/summary/mmv.html
`pacman -Ss mmv` shows nothing
Thanks.
 Comments: 
 Comment 0: Not every Unix packages available here. Msys2 focuses on Win32 native programs https://www.msys2.org/docs/what-is-msys2/#msys2-vs-cygwin
 Comment 1: Ok. How to mass rename files?
 Comment 2: Answers https://duckduckgo.com/?q=How+to+rename+multiple+file+in+Windows&ia=web
 Comment 3: At least base package contains `rename`
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