yank command in vi editor

Hello I am using vi editor on ubuntu 9.10. Yet several vi commands do not work. e.g yank (y), put (p) and repeat (.) Could you please suggest what is the reason? Is there a difference between standard unix vi edition and linux vi edition? Thank You Nachshon Yeshurun Ariel unive

FW: +N option in tail command

Hello Man pages for the tail command shows the ability to use the +N option. Yet, attempting it on Ubuntu 9.10 results in an error. Is this a bug? >From man pages: -n, --lines=N output the last N lines, instead of the last 10; or use +N to output lines start