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Listar certificado

  URL=google.com;PORT=443;OLDIFS=$IFS; IFS=':' certificates=$(echo | openssl s_client -showcerts -servername $URL -connect $URL:$PORT 2>/dev/null | sed -n '/-----BEGIN/,/-----END/ {/-----BEGIN/ s/^/:/; p}'); for certificate in ${certificates#:}; do echo;echo $certificate | openssl x509 -noout -subject -issuer -dates ;echo; done; IFS=$OLDIFS

El resultado es este:
<code>
subject=CN = *.google.com
issuer=C = US, O = Google Trust Services LLC, CN = GTS CA 1C3
notBefore=Mar  4 06:35:50 2024 GMT
notAfter=May 27 06:35:49 2024 GMT


subject=C = US, O = Google Trust Services LLC, CN = GTS CA 1C3
issuer=C = US, O = Google Trust Services LLC, CN = GTS Root R1
notBefore=Aug 13 00:00:42 2020 GMT
notAfter=Sep 30 00:00:42 2027 GMT


subject=C = US, O = Google Trust Services LLC, CN = GTS Root R1
issuer=C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA
notBefore=Jun 19 00:00:42 2020 GMT
notAfter=Jan 28 00:00:42 2028 GMT
</code>

Si quitamos noout  nos escribe el certificado