Don’t worry I will let you know about Nipper-ng Package Description software so that you can have idea and remember easily.

The Nipper-ng Package Description software used to make observations about the security configurations of many different device types such as routers, firewalls, and switches of a network infrastructure.

Other words
Nipper is a Network Infrastructure Configuration Parser. Nipper takes a network infrastructure device configuration, processes the file and details security-related issues with detailed recommendations. Nipper was previous known as CiscoParse.

Command:
nipper [Options]

General Options:
--input=<file>
Specifies a device configuration file to process. For CheckPoint
Firewall-1 configurations, the input should be the conf directory.

--output=<file> | --report=<file>
Specified an output file for the report.

--csv=<file>
Want to output the network filtering configuration to a CSV file?.

--version
Displays the program version.

Example:
The example below will process a Cisco IOS-based router
configuration file called ios.conf and output the report to a file
called report.html.

nipper --ios-router --input=ios.conf --output=report.html

For additional help:
--help[=<topic>]
Show the online help or show the additional help on the topic
specified. The help topics are; GENERAL, DEVICES, DEVICES-ADV,
SNMP, REPORT, REPORT-ADV, REPORT-SECT, REPORT-HTML, REPORT-LATEX,
AUDIT-ACL, AUDIT-PASS, AUDIT-ADV or CONFIG-FILE.