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Ill try and explain this first:

sprintf("%-*s", t-f+1, v) substr(s,t+1)
s=string
f=from
t=to
v=New value

t-f+1 = length of new string

sprintf will left justify New value to width of...

That's an awesome solution. I will try to analyze it, Chubler please correct if I mess up along the way ;)
Let's look at the sprintf call:
sprintf("%-*s", t-f+1, v)
The format flags of sprintf...