Examples/Sample_Environment_CreatePathVariable.ps1

<#
    .SYNOPSIS
        Creates the environment variable 'TestPathEnvironmentVariable' and sets the value to 'TestValue'
        if it doesn't already exist or appends the value 'TestValue' to the existing path if it does
        already exist on the machine and within the process.
#>

Configuration Sample_Environment_CreatePathVariable 
{
    param ()

    Import-DscResource -ModuleName 'PSDscResources'

    Node localhost
    {
        Environment CreatePathEnvironmentVariable
        {
            Name = 'TestPathEnvironmentVariable'
            Value = 'TestValue'
            Ensure = 'Present'
            Path = $true
            Target = @('Process', 'Machine')
        }
    }
}

Sample_Environment_CreatePathVariable