you can 
<echo>put your entire command line here</echo>

or redirect exec stdout with the ant exec task 'output' attribute e.g.
<exec executable="VBoxManage" failifexecutionfails="false" 
output="Somefile.txt">
 <arg line="controlvm ${vbox.vmname} poweroff"/>
</exec>        

and view the contents of 'Somefile.txt' after execution

http://ant.apache.org/manual/CoreTasks/exec.html

HTH
Martin 
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> Date: Fri, 6 Mar 2009 06:44:49 -0800
> From: [email protected]
> To: [email protected]
> Subject: how to "echo" exec command
> 
> 
> how do I "echo" or display the full command exec is about to run?  In my
> example I should see 
> [exec] VBoxManage controlvm vm poweroff
> but nothing is shown.
> 
> ant version=1.7 os = fedora 10 shell=bash, jdk=1.5.8
> 
>     <target name="vbox" depends="-init-run">
>         <exec executable="VBoxManage" failifexecutionfails="false">
>             <arg line="controlvm ${vbox.vmname} poweroff"/>
>         </exec>        
>      ....
> 
> vbox:
>      [exec] 
>      [exec] VirtualBox Command Line Management Interface Version 2.1.4
>      [exec] (C) 2005-2009 Sun Microsystems, Inc.
>      [exec] All rights reserved.
> 
> -- 
> View this message in context: 
> http://www.nabble.com/how-to-%22echo%22-exec-command-tp22373827p22373827.html
> Sent from the Ant - Users mailing list archive at Nabble.com.
> 
> 
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