Oh yeah. 'man cp' from my Arch Linux machine:
---
SEE ALSO
The full documentation for cp is maintained as a Texinfo manual. If the info and cp programs are properly installed at your site, the command
info coreutils 'cp invocation'
should give you access to the complete manual.---
I ran that 'info' command and promptly ran the one emacs command I have memorized: C-x C-c
:)