docs: Extending documentation and manpages
Refs: #1462
Change-Id: If33a0f3c623daf3502ed301bcdc63892779463e3
diff --git a/docs/manpages/ndnsec-cert-install.rst b/docs/manpages/ndnsec-cert-install.rst
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+ndnsec-cert-install
+===================
+
+``ndnsec-cert-install`` is a tool to install a certificate into **Public Information Base (PIB)**.
+
+Usage
+-----
+
+::
+
+ $ ndnsec-cert-install [-h] [-IKN] cert-source
+
+Description
+-----------
+
+``ndnsec-cert-install`` can insert a certificate into PIB. By default, the installed certificate
+will be set as the default certificate of its corresponding identity and the identity is set as
+the system default identity.
+
+``cert-source`` could be a filesystem path or an HTTP URL of a file containing to certificate to
+install or . If ``cert-file`` is ``-``, the certificate will be read from standard input.
+
+Options
+-------
+
+``-I``
+ Set the certificate as the default certificate of its corresponding identity, but do not change
+ the system default identity.
+
+``-K``
+ Set the certificate as the default certificate of its corresponding key, but do not change the
+ corresponding identity's default key and the system default identity.
+
+``-N``
+ Install the certificate but do not change any default settings.
+
+Examples
+--------
+
+Install a certificate and set it as the system default certificate:
+
+::
+
+ $ ndnsec-cert-install cert_file.cert
+
+Install a certificate with HTTP URL and set it as the system default certificate:
+
+::
+
+ $ ndnsec-install-cert "http://ndncert.domain.com/cert/get/my-certificate.ndncert"
+
+Install a certificate but do not change any default settings:
+
+::
+
+ $ ndnsec-cert-install -N cert_file.cert