sum4.awk


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#!/usr/bin/awk -f

### sum4.awk, print sums of numeric columns
# input:    rows of integers and strings
# output:   sums of numeric columns

function isnum(n) {
    sign = "[+-]?"
    decimal = "[0-9]+[.]?[0-9]*"
    fraction = "[.][0-9]+"
    exponent = "([Ee]" sign "[0-9]+)?"
    number = "^" sign "(" decimal "|" fraction ")" exponent "$"
    return n ~ number
}

NR==1 {
    nf_max = NF
    for (i=1; i<=NF; i++) {
        (!isnum($i)) ? header[i] = $i : header[i] = "col" i
    }
}

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

END {
    for (i=1; i<=nf_max; i++) {
        if (header[i])
            printf("%s:" OFS, header[i])
        printf(OFMT ORS, sum[i])
    }
}