VI

vi filename

Open the file filename for editing in VI

Once within VI, some example commands:

i	Enter insert mode to start typing text
Esc	Exit insert mode
:w	Save the file
:w filename	Save the file as filename
:wq	Save the file and quit VI
:q!	Quit VI without saving changes
:59	Go to line number 59
h,j,k,l	Move the cursor left, up, down, right
yy	Copy a whole line of text
p	Paste a copied line of text
x	Delete a character
u	Undo
4dw	Delete 4 words
4dd	Delete 4 lines
/pattern	Search for the next occurrence of pattern
n	Search for the next occurrence of the previously searched pattern
?pattern	Search backwards for pattern