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How do I do the product of nth filed just like sum. For sum I know like
awk '{ sum += $12 } END {printf "%.2f\n", sum}'
works as initial sum = 0.

But for product how do initialize the variable...

The order of egrep output seems to be as they occur in the file. How do I get the order as requested? For e.g.


file contents:
AAA
EEE
GGG

egrep 'GGG|AAA|EEE' file

gives
AAA
...