Installing Nmap
On most modern operating systems (Windows, OS X, and most distributions of Linux), installing Nmap is a very easy task. The official Nmap website (http://insecure.org/) distributes downloadable installers for Windows and Mac OS X that are very easy to run.
For Windows, a full walk-through of the installation process is available at http://nmap.org/book/inst-windows.html.
For Mac OS X, a full walk-through of the installation process is available at http://nmap.org/book/inst-macosx.html.
To install Nmap for Linux, there are several options. The most recent "bleeding edge" builds are always available to install from source (see the following paragraph). There are RPMs that can be downloaded from the http://insecure.org/ website, but ...
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