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 $ A="08"
 $ B="01"
 $ printf "%02d" $(($A + $B))
bash: 08: value too great for base (error token is "08")
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$ printf "%02d" $((10#$A + 10#$B))
09

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$ C=$(builtin printf "%02d" $((10#$A + 10#$B)))
$ echo ”$C”
”09”


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