The following command creates an SPC from myCertificate.cer and places it in mySPCFile.spc.
cert2spc myCertificate.cer mySPCFile.spc
The following command creates an SPC from oneCertificate.cer and twoCertificate.cer and places it in mySPCFile.spc.
cert2spc oneCertificate.cer twoCertificate.cer mySPCFile.spc