These are VI commands I have just learned today
F = reverse of f
t = f and step back 1 char
T = reverse of t
; = repeat f, F, t and T
H = Move cursor to first line of the screen
M = Move cursor to middle of the screen
L = Move cursor to last line of the screen
z. || zz = Move screen to make cursor to middle of the screen
zt = Move screen to make cursor to top of the screen
zb = Move screen to make cursor to bottom of the screen
Ctrl+f = Scroll down 1 screen (Ctrl+d only half screen)
Ctrl+b = reverse of Ctrl+f
Ctrl+e = Move screen down 1 line with the cursor try to stay at the sameline
Ctrl+y = reverse of Ctrl+y
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Print some ANSI characters (print (str (char 27) "[2J")) ; clear screen (print (str (char 27) "[;H")) ; move cursor to...