Assigning output of a command to a variable

[john blair]

I am new to maven and I am sorry if this sounds stupid. I am trying to assign 
the output of a command to a variable.
The command is triple=`./config.guess`.
I tried the following with no luck 
  <goal name="mine" description="test">
    <exec dir="src"
          executable="env"
          failonerror="true">
     <arg line="triple=`./config.guess`"/>
    </exec>
  </goal>


Can someone tell how to do this?
Thanks

                
---------------------------------
Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls.  Great rates 
starting at 1&cent;/min.