delete-certificate [-h] [-c name] [-Z hash] [-t] [keychain...] Delete a certificate from a keychain. If no keychain arguments are provided, the default search list is used. -c name Specify certificate to delete by its common name -Z hash Specify certificate to delete by its SHA-1 hash -t Also delete user trust settings for this certificate The certificate to be deleted must be uniquely specified either by a string found in its common name, or by its SHA-1 hash.
“Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing” ~ Helen Keller
security - Administer Keychains, keys, certificates and the Security framework.