add a string to the end of each line

:%norm A*

	%       = for every line
	norm    = type the following commands
	A*      = append '*' to the end of current line

	OR

:%s/$/\*/g



change case:  visual block + U/u



	replace | to new line
:%s/|/\r/g



	yank whole file
:%y+


	view hex
	in vi
	type 
:%!xxd
	to view the hex strings, then 
:%!xxd -r 
	to return to normal editing