how to download the ssl certificate from a website
In order to download the certificate, you need to use the client built into openssl like so:
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That will save the certificate to /tmp/$SERVERNAME.cert.
You can use -showcerts if you want to download all the certificates in the chain. But if you just want to download the server certificate, there is no need to specify -showcerts
echo -n gives a response to the server, so that the connection is released
sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' removes information about the certificate chain and connection details. This is the preferred format to import the certificate into other keystores.