How to fetch HTTPS end point certificate chain via Shell ?

You can do it through the web browser - and download each and every certificate...

Following is the easy way via shell..
$ openssl s_client -showcerts  -connect www.amazon.com:443 > ssl.log

depth=1 C = US, O = "VeriSign, Inc.", OU = VeriSign Trust Network, OU = Terms of use at https://www.verisign.com/rpa (c)09, CN = VeriSign Class 3 Secure Server CA - G2
verify error:num=20:unable to get local issuer certificate
verify return:0

CtrL+C

$ sed -n  '/-----BEGIN CERTIFICATE-----/,/-----END CERTIFICATE-----/p' ssl.log  > cert.pem
The above will save the certificate chain corresponding to www.amazon.com in cert.pem file.
-----BEGIN CERTIFICATE-----
MIIE9jCCA96gAwIBAgIQJfXRLV5vC9Tq8qLJZvO0zjANBgkqhkiG9w0BAQUFADCB
tTELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMR8wHQYDVQQL
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VmVyaVNpZ24gQ2xhc3MgMyBTZWN1cmUgU2VydmVyIENBIC0gRzIwHhcNMTAwNzE1
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V2FzaGluZ3RvbjEQMA4GA1UEBxQHU2VhdHRsZTEYMBYGA1UEChQPQW1hem9uLmNv
bSBJbmMuMRcwFQYDVQQDFA53d3cuYW1hem9uLmNvbTCBnzANBgkqhkiG9w0BAQEF
AAOBjQAwgYkCgYEAvokOoa36fVhqoWrkO+115D7yGffzD/rZ72IQUnv83ZSWqDVr
G1BgLi55rHwuo4HejTf57m5PgsfkEgRVr1dplIzvLlB6bVMPW19iWF7P8t/0Tc5x
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FiRodHRwOi8vbG9nby52ZXJpc2lnbi5jb20vdnNsb2dvMS5naWYwDQYJKoZIhvcN
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io/dPGHXwOvxcjTkTz/nM0CpSZ9EsI2/M7F2laNQIY+PDB5ggl4gmPq/GTMaEqFh
YT+oXLiAmqA03N1SjJiFum3OvOBMqZs4xU1WELrvcoobCGh73VlD5TMbCj+9QyrL
7jQ2Q9Vp18p6g6mr5hXvlOiVZSv2nhFOXw4ZAXahMDYGUvEJ4M/UcRYNgLoSJp6T
Sxxfg0ws0Gk7xZkxxEyPJ75JmqwhPkpd4RjTOURiBBbazNjtPYjSpuOub+sTr/Ft
ftICSDU8L5qg9bxV6qR7it5iC3OcWEEcLFE=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIGLDCCBZWgAwIBAgIQbk/6s8XmacTRZ8mSq+hYxDANBgkqhkiG9w0BAQUFADCB
wTELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMTwwOgYDVQQL
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IC0gRzIxOjA4BgNVBAsTMShjKSAxOTk4IFZlcmlTaWduLCBJbmMuIC0gRm9yIGF1
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d3cudmVyaXNpZ24uY29tL3JwYSAoYykwOTEvMC0GA1UEAxMmVmVyaVNpZ24gQ2xh
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gfMMrQ/cYWIbEAsEHikYcV5iy0PevjG6cQIZTiapUdqMZGkD3pz9ff17Ybz8hHyI
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CSqGSIb3DQEBBQUAA4GBAGN0Lz1Tqi+X7CYRZhr+8d5BJxnSf9jBHPniOFY6H5Cu
OcUgdav4bC1nHynCIdcUiGNLsJsnY5H48KMBJLb7j+M9AgtvVP7UzNvWhb98lR5e
YhHB2QmcQrmy1KotmDojYMyimvFu6M+O0Ro8XhnF15s1sAIjJOUFuNWI4+D6ufRf
-----END CERTIFICATE-----