sum3.awk


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### sum3.awk, print sums of numeric columns
# input:    rows of integers and strings
# output:   sums of numeric columns
#   assumes every line has same layout

NR==1 {
    nfld = NF
    for (i=1; i<=NF; i++)
        numcol[i] = isnum($i)
}

{
    for (i=1; i<=NF; i++)
        if (numcol[i])
            sum[i] += $i
}

END {
    for (i=1; i<=nfld; i++) {
        if (numcol[i])
            printf("%g", sum[i])
        else
            printf("--")
        printf(i < nfld ? "  " : "\n")
    }
}

function isnum(n) {
    return n ~ /^[+-]?[0-9]+$/
}