You would use the same command you are already using (if you only care about subject information, you could use openssl x509 -subject-noout-in server.crt, replacing-text with-subject).
Viruses cause colds and the flu. Both are respiratory infections. The simplest way to tell the difference is by looking at your symptoms. If you have a cold, youâll probably have symptoms like these: runny or stuffy nose; sore throat; sneezing; cough; headache or body aches; mild tiredness; Flu symptoms can include: dry, hacking cough
Early symptoms of the flu may include conditions such as  excessive or sudden fatigue or body aches and chills, according to Healthline. While fatigue can be an early symptom of a cold, in people who have the flu, the fatigue is much worse.