fierce command not found

Introduction

When you run more command in linux terminal / console, you get the following error message

fierce: command not found

or when using sudo you get the following error message

sudo: fierce: command not found

Solutions to fierce: command not found

How To Fix fierce: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu fierce is provided by fierce package.

fierce is:

Fierce is a semi-lightweight scanner that helps locate non-contiguous IP space and hostnames against specified domains. It’s really meant as a pre-cursor to nmap, unicornscan, nessus, nikto, etc, since all of those require that you already know what IP space you are looking for. This does not perform exploitation and does not scan the whole internet indiscriminately. It is meant specifically to locate likely targets both inside and outside a corporate network.

Because it uses DNS primarily you will often find mis-configured networks that leak internal address space. That’s especially useful in targeted malware. Originally written by RSnake along with others at http://ha.ckers.org/. This is simply a conversion to Python 3 to simplify and modernize the codebase.

To fix this problem, we can install more using the command below.

sudo apt-get -y install fierce

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install fierce.

sudo apt -y install fierce

Or if you have aptitude installed you can use the following command.

sudo aptitude install fierce

Summary

In this tutorial we learn how to fix fierce command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.