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`openssl`: Subject Alternative Name

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linux-howto

http://unix.stackexchange.com – I wrote this bit of code to get the Common Name of the subject field in the SSL certificate for a given domain: $ echo -e "GET / HTTP/1.1\nEOT" | openssl s_client -connect google.com:443 2>&1 | grep subject subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=*.google.com However, this only gives me the “subject” value. Alternative CNs may be listed in the “Subject Alternative Name” field. For example: So, how can I get the value of the Subject Alternative Name field in Bash? (HowTos)