public GetPatchBaselineResult withOperatingSystem(OperatingSystem operatingSystem) {
        this.operatingSystem = operatingSystem.toString();
        return this;
    }
<p>
Returns the operating system specified for the patch baseline.
</p>

@param operatingSystem
       Returns the operating system specified for the patch baseline.
@return Returns a reference to this object so that method calls can be chained together.
@see OperatingSystem
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/GetPatchBaselineResult.java