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Someday, I will learn what all of those codes with the 'sed' mean :o

The data to report is a counter; my guess is normally between one and seven digits. Thus I could want to see
1,234,567
123,456
12,345
1,234
123
12
1
I could be...

var=12345
echo $var >>>12345

printf "%8.1f \n" $var >>> 12345.0

How to get this as 12,345?
I suppose I could break into sections by dividing by 1000 or 1000000.
But, is the a trick to...