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How to replace the 2nd character in a string using sed?

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Operating Systems Linux How to replace the 2nd character in a string using sed?
# 1  
Old 10-30-2009
How to replace the 2nd character in a string using sed?
Hi,
i have string var1=NN. Based on conditions, i have to change this first N to Y or second N to Y and send the details to other process. How to do that? This is a linux machine.

Thanks,
Selva
# 2  
Old 11-02-2009
bash has this:
${stringSmilieosition:length}
Code:
var1="NN"
if [[ "$condition1" = "OK" ]] ; then
   tmp="Y""${var1:2:1}"
else
   tmp="${var1:1:1}""Y"
fi 
var1=$tmp

gives YN and NY depending on condition1
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