The script is used to install the FreeRADIUS Server on CentOS 6.x. To install FreeRADIUS, you just need to keep all the files into one directory and execute 'master.sh' file.
You may also like to manage you FreeRADIUS Server using web interface instead of CLI. You can get the Radius Manager Web Interface from: https://github.com/arch-lamp/freeradius-web-ui