How to multiply two columns in awk?

awk '{ print $1, $1 * $2 }' input.txt > output.txt

Here is an awk solution:

$ awk '$0=$1" "$1*$2' input.txt 
1 677679866
2 243735232
3 148239594
4 161663928

But you can do it many ways, here is a perl solution:

$ perl -ape 's/$F[1]/$F[0]*$F[1]/e' input.txt
1 677679866
2 243735232
3 148239594
4 161663928

You can make change inplace, by using -i option:

$ perl -i.bak -ape 's/$F[1]/$F[0]*$F[1]/e' input.txt

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