=head1 SYNOPSIS
B<openssl> B<rsautl>
+[B<-help>]
[B<-in file>]
[B<-out file>]
[B<-inkey file>]
=over 4
+=item B<-help>
+
+Print out a usage message.
+
=item B<-in filename>
This specifies the input filename to read data from or standard input
=item B<-pubin>
-the input file is an RSA public key.
+the input file is an RSA public key.
=item B<-certin>