Command for copy
 

could you please tell me what are the commands for copy and paste for a particular word or sentence of a line in vi editing mode of a file for Redhat Enterprise v.4. As well what are the commands for Visual Mode.
.....Thank you !

man vimtutor (have fun learning!)

A copy is a 'yank', so: 12yw = yank 12 words

A paste is P (but not in insert mode)

That's the most basic stuff - play with the tutor to learn more.

There's plenty of documentation available on how to use VI editor but graphically and on command line. You might want to Google for some links.
A quick one is below:
http://www.cs.rit.edu/~cslab/vi.html

Hope this would help.

+ Varun.

In visual mode:
-highlight the the text, press d tu cut, y to copy
-move to target location, press P to paste aftercursor or p to paste before the cursor

vi command copy by row (not in insert mode)

:set number
:a,b y and press p button to paste (before paste u need to point the cursor to the location u want to paste)

a = row start copy (put in number)
b = row end copy (put in number)
y = copy