Defining macros in a resource file
In this recipe, you'll learn how to define custom user macros in resource files. This is good practice for strings used in check_command definitions or other directives that are shared by more than one host or service. For example, take a look at the following example of writing the full path in a command_name directive:
command_name=/usr/local/nagios/libexec/check_ssh $HOSTADDRESS$
In lieu of this, we could write the following line:
command_name=$USER1$/check_ssh $HOSTADDRESS$
As a result, if the location of the check_ssh script changes, we only need to change the value of $USER1$ in the appropriate resource file to update all of its uses throughout the configuration.
Most of the macros in Nagios Core are defined ...
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