Error checking if the certificate is signed with the root authority key?

Question

Cryptography

Good afternoon! An error occurred in openSSL when checking if a user certificate is signed with this root key
. openSSL> req -in my.crt -noout -verify -key RootCA.key
Gives an error unable to load x509 request The request
file is present.

Answer 1

If I'm not mistaken, then the req module is needed to work with certificate requests. And there is nothing to check in the certificate request. Actually, openSSL hints at this.
As you correctly wrote in the comment, you need the verify module.