This document also uses several fonts to help clarify the meaning of the text.

fixed	Literal commands you type appear in Courier font
italic	Variables used with commands will appear in italics
bold	Keys or elements that you must click appear in bold
[ ]	Optional variables will appear in square brackets

 The following commands are helpful when using Vi:

u	undo the last change
U	undo the changes made to the current line
.	repeat your last command again
"	return to your previous position
' '	return to the beginning of the line at your previous position in the document
Ctrl + l	redraw the screen if it has been altered by output from some other program or a transmission error (such as a talk request)
Ctrl + g	print the line number of the current line and how many lines are in the document
%	show matching (), {}, or [] when the current character is one of the characters
[num] J	join num lines together, starting with the current line (delete the Returns between the lines)
:r filename	read a file into the document below the current line
~	change the case of the current character