openssl-nseq, nseq - create or examine a Netscape certificate sequence
openssl nseq [-help] [-in filename] [-out
  filename] [-toseq]
The nseq command takes a file containing a Netscape certificate sequence
  and prints out the certificates contained in it or takes a file of
  certificates and converts it into a Netscape certificate sequence.
  - -help
- Print out a usage message.
- -in filename
- This specifies the input filename to read or standard input if this option
      is not specified.
- -out filename
- Specifies the output filename or standard output by default.
- -toseq
- Normally a Netscape certificate sequence will be input and the output is
      the certificates contained in it. With the -toseq option the
      situation is reversed: a Netscape certificate sequence is created from a
      file of certificates.
Output the certificates in a Netscape certificate sequence
 openssl nseq -in nseq.pem -out certs.pem
Create a Netscape certificate sequence
 openssl nseq -in certs.pem -toseq -out nseq.pem
The PEM encoded form uses the same headers and footers as a certificate:
 -----BEGIN CERTIFICATE-----
 -----END CERTIFICATE-----
A Netscape certificate sequence is a Netscape specific format that
    can be sent to browsers as an alternative to the standard PKCS#7 format when
    several certificates are sent to the browser: for example during certificate
    enrollment. It is used by Netscape certificate server for example.
This program needs a few more options: like allowing DER or PEM input and output
  files and allowing multiple certificate files to be used.
Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You
    may not use this file except in compliance with the License. You can obtain
    a copy in the file LICENSE in the source distribution or at
    <https://www.openssl.org/source/license.html>.