How to use awk variables in regular expressions?

Question

I have a file called domain which contains some domains. For example:

google.com
facebook.com
...
yahoo.com

And I have ano

Answer 1

One way using an awk script:

BEGIN {
    FS = "[. ]"
    OFS = "."
}

FNR == NR {
    domain[$1] = $0
    next
}

FNR < NR {
    if ($2 in domain) {
        for ( i = 2; i < NF; i++ ) {
            if ($i != "") {
                line = (line ? line OFS : "") $i
            }
        }
        total[line] += $NF
        line = ""
    }
}

END {
    for (i in total) {
        printf "%s\t%s\n", i, total[i]
    }
}

Run like:

awk -f script.awk domain.txt site.txt

Results:

facebook.com    37
google.com  18