vip: z Command

 
 1.4.4 z Command
 ---------------
 
 For those of you who cannot remember which of ‘z’ followed by <RET>, ‘.’
 and ‘-’ do what.  You can also use ‘z’ followed by ‘H’, ‘M’ and ‘L’ to
 place the current line in the Home (Middle, and Last) line of the
 window.