Useful commands to check SSL certs

Here's some useful stuff to examine SSL certs.
I've pulled some of this from here

Check a key

• openssl rsa -in key.file -check
• openssl ec -in key.file (For an EC cert)

Check a cert

• openssl x509 -in cert.file -text -noout

 Test an SSL connection

• openssl s_client -connect some.site.com:443
• openssl s_client -connect some.site.com:443 -servername some.site.com
  (If website uses SNI)