Its possible to upgrade Nagios CORE to the latest version by just following these simple steps. This article covers upgrade, backup and restore in case of a failure.The Latest Version of Nagios CORE is 4.2.4 as of January,2017 for which you can download the Source files from Nagios Website. The process would involve stopping of Nagios and Apache service, compiling Nagios from source and then restart both the services. You need to be admin/Root user to implement the upgrade.

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It's possible to get a list of users of active users in IDM/IPA with formatted date and time by running this one liner command. It gets you the list of users with last successsful authentications to IDM/IPA server. Very handy command when it's required for Audit purposes. It will also give you the list of users who last changed password and you can modify it according to your requirements.

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Its now possible to install latest Nagios CORE version on Raspbian by following the steps in this article. Before writing this article I Googled for the same but couldn't find a single article covering install of latest version of Nagios on RasberryPi hence this guide. It has been fully tested and working on my personal RasPi.

This guide was originally written for Ubuntu but will work for Raspbian (Debian Jessie) flavour for RasberryPi as well. It might work for all debian distros but not guranteed, you can try it out yourself.

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Its possible to use awk in Alias command. I did that by simply just modifying some parenthesis and there you go, had a working awk command.

All that it required was closing awk in double quotes as opposed to single quotes and forward slash before the "$" variable. This alias command is for printing the default Gateway for an interface.

 alias eth0-gw='route -n | grep eth0 | awk "NR==1{ print \$2 }"'
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