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require 'resolv' | |
url = 'mail.bocistudio.com' | |
begin | |
r = Resolv::DNS.open do |dns| | |
dns.getresource(url, Resolv::DNS::Resource::IN::CNAME) | |
end | |
r.name.to_s # => return alias domain | |
rescue Resolv::ResolvError => e | |
# handle error |
This was tested on MacOS 10.14.5 on 2019-07-16
schemacrawler is a free and open-source database schema discovery and comprehension tool. It can be invoked from the command-line to produce, using GraphViz, images/pdfs from a SQLite (or other database type) file. It can be used from the command-line to generate schema diagrams like these: