Appending to an Existing File

You can use the UNIX redirect and append operator (>>) with w to append all or part of the contents of the buffer to an existing file. For example, if you entered:

:1,10w newfile

and then:

$ 

:340,$w >>newfile

newfile would contain lines 1-10 and line 340 to the end of the buffer.

- TOR from Anonymous' vi Editor, Chapter 5