It there a command to show how many days certificate you have?

If you use certbot (https://certbot.eff.org/), it’s simply a matter of using

certbot certificates

If you need to filter for a particular domain the result, do

certbot certonly --cert-name example.com

This answer has been clearly borrowed from the official certbot documentation at https://certbot.eff.org/docs/using.html#where-are-my-certificates

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