openssl x509

Inspect certificates

low risk

interactive breakdown — edit the command and press Explain
$ 
What it does

Print dates, subject, fingerprint of certificates.

Examples
openssl x509 -in cert.pem -noout -dates -subjectDates and subject · explain & risk-check →
openssl x509 -in cert.pem -noout -fingerprint -sha256Fingerprint · explain & risk-check →
Related
openssl
Open the full explainer →More in Users, Permissions & Security

Reference text is hand-written and may be incomplete — check man openssl for your version. Test destructive commands on a non-production system first.