public String getOperatingSystem() {
        return this.operatingSystem;
    }
<p>
Defines the operating system the patch baseline applies to. The default value is <code>WINDOWS</code>.
</p>

@return Defines the operating system the patch baseline applies to. The default value is <code>WINDOWS</code>.
@see OperatingSystem
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/PatchBaselineIdentity.java