Mac Mojave Install Nagios Quick-Start Guide
Hi! This is Tutorial Shows You Step-by-Step How-to Install Nagios Network Monitoring in Mac OS X 10.14 Mojave Unix/BSD Desktop.
And Nagios for Mac 10.14 is a powerful Network Monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

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Open a Shell Terminal emulator window
Applications > Utilities > Terminal
(Press “Enter” to Execute Commands)