sum2.awk


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#!/usr/bin/awk -f

### sum2.awk, print column sums
# check that each line has the same number of fields as line one

NR==1 { nf_max = NF }

{
    for (i=1; i<=NF; i++)
        sum[i] += $i
    if (NF != nf_max)
        print "line " NR " has " NF " entries, not " nf_max
}

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