[Ant]Tomcat control target

this task can run correctly in windows, but it cann't run in linux server, because there is no cmd program in linux
 <target name="tomcat-start">   

       <exec dir="${tomcat}/bin" executable="cmd">

           <env key="CATALINA_HOME" path="${tomcat}"/>

           <arg value="/c startup.bat"/>

       </exec>

    </target>

    <target name="tomcat-stop" >

       <exec dir="${tomcat}/bin" executable="cmd">

           <env key="CATALINA_HOME" path="${tomcat}"/>

           <arg value="/c shutdown.bat"/>

       </exec>

    </target>

modify task base on upper task

    <target name="stop-tomcat" description="tomcat stoping.....">

       <exec executable="${tomcat}/bin/shutdown.sh" spawn="true" vmlauncher="false">

           <env key="CATALINA_HOME" value="${tomcat}" />

           <arg line="/c start ${tomcat}/bin/shutdown.sh" />

       </exec>

       <sleep seconds="5" />

    </target>

    <target name="start-tomcat" description="tomcat starting.....">

       <exec executable="${tomcat}/bin/startup.sh" spawn="true" vmlauncher="false">

           <env key="CATALINA_HOME" value="${tomcat}" />

           <arg line="/c start ${tomcat}/bin/startup.sh" />

       </exec>

    </target>

finally can work in linux server!