📄 sum.awk
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# accumulate totals and transactions for each person
# print the transactions in a separate file for each person
# print the total and average when done
NF == 2 { a[$1] += $2; b[$1]++
printf "%-6s %3d %3d %3d\n", $1, $2, a[$1], b[$1] >$1
}
END { print ""
for (i in a)
printf "%-6s %3d %6.1f %3d\n", i, a[i], a[i]/b[i], b[i]
}
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