openssl x509 -in certificate.pem -text
openssl x509[ -inform | -text | -dates | -subject | --help]
openssl x509
-inform | -text | -dates | -subject
--help
Certificate: .pem, .ppk, .pfx, .p12, .cer, .crt, openssl pkcs12, .csr, .pub, PFX, PKCS, PKCS
.pem
.ppk
.pfx
.p12
.cer, .crt
openssl pkcs12
.csr
.pub
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