Installing Nagios
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How-to Install HomeBrew for Mac OS X 10.15 Catalina:
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Then to Install Nagios on Mac
Simply play:brew install nagios
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Again Create a Command Directory
With:mkdir -p ~/homebrew/var/lib/nagios/rw
And setup Ownership & Permissions:
sudo chgrp _www ~/homebrew/var/lib/nagios/rw
sudo chmod 2775 ~/homebrew/var/lib/nagios/rw