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Change the $domain variable to whichever domain you wish to query.
Works with the majority of whois info; for some that won't, you may have to compromise:
domain=google.com; for a in $(whois $domain | grep "Domain servers in listed order:" --after 3 | grep -v "Domain servers in listed order:"); do echo ">>> Nameservers for $domain from $a
Note that this doesn't work as well as the first one; if they have more than 3 nameservers, it won't hit them all.
As the summary states, this can be useful for making sure the whois nameservers for a domain match the nameserver records (NS records) from the nameservers themselves.
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