running multiple testplans from the command line

[Matthew Perpick]

does anyone know how to run multiple test plans from the command line
and have the results saved in one file?
 
i want to replicate this without using ant (because it sucks): 
<jmeter
    jmeterhome="c:\jakarta-jmeter-1.8.1"
    resultlog="${basedir}/loadtests/JMeterResults.jtl">
        <testplans dir="${basedir}/loadtests" includes="*.jmx"/>
</jmeter>
 
thanks,
matt