nseq
Specify the name of the file from which a Netscape certificate
sequence or X.509 certificates will be read. If this option is
omitted, stdin will be used.
Specify the name of the file to which a Netscape certificate sequence
or X.509 certificates will be written. If this option is omitted,
stdout will be used.
Cause the input file to be treated as X.509 certificates rather than as the default of a Netscape certificate sequence. The output will be a Netscape certificate sequence created from the X.509 certificates.