Environment variables in a OS User-Defined Metric Page

I'm creating an OS-based User-Defined Metric in a Grid Control through a perl script
How can I pass my own environment variables in the script setting the User-Interface Element- Environment, where for example i can specify var1=%perlBin% var2=%scriptsDir% etc ?
The description in the User-Defined Metric Page says:
Environment
See Available Properties box for values you can assign to environment variables. Enter as space-separated list: var1=prop1 var2=prop2
-r
Josh

That's exactly correct, you can specify them in the Environment field as defined here:
Table 15-3 Create User-Defined Metric Page: Definition
User-Interface Element Description
Metric Name
Metric name identifying the user-defined metric in the Enterprise Manager user interface. This name must be unique for all User-Defined Metrics created on that host.
Metric Type
Type of the value returned by the user-defined script. Choose "NUMBER" if your script returns a number. Choose "STRING" if your script returns an alphanumeric text string.
Command Line
Enter the complete command line entry required to execute the user-defined script. You must enter the full command path as well as full path to the script location. For example, to run a Perl script, you might enter something like the following in the Command Line entry field:
/u1/bin/perl /u1/scripts/myScript.pl
The content of the Command Line is passed as a literal string, so you may use any syntax, special characters, or parameters allowed by your operating system.
Environment
Optional. Enter any environmental variable(s) required to run the user-defined script. A list of predefined properties that can be passed to your script as variables is listed in the Available Properties box. You may also specify your own environment variables. Multiple variables can be defined as a space-separated list.
Example: If your script uses three variables (var1, var2, var3) where var1 is the location of the Perl directory (predefined), var2 is the directory where your Perl scripts are stored (predefined), and var3 is an Oracle home, your entry in the Environment text entry field would appear as follows:
var1=%perlBin% var2=%scriptsDir% var3=/u1/orahome10
For example, simply set var1=/this/is/the/directory/i/want/to/have/set/in/var1
then var1 will be /this/is/the/directory/i/want/to/have/set/in/var1

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Environment variables in a OS User-Defined Metric Page

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