My posts are usually notes and reference materials for myself, which I publish here with the hope that others might find them useful.
There really should be an
s_client option to do this. In lieu of, use
s_client to read the cert and pipe it to the
echo | openssl s_client -connect example.com:443 -servername example.com 2>/dev/null | openssl x509 -noout -dates
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