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About arg, I can't say. But for param we do have one solution:

    <param name="url" command="bash -c 'printf &quot;today the url is http://mydomain.com/%s&quot; &quot;`date +%Y-%m-%d`&quot;'" />

I'm still figuring out how to pass param as substitution arg (perhaps using launch-prefix in <test> or <node> tag), but the above might solve your problem..

About arg, I can't say. But for param we do have one solution:

    <param name="url" command="bash -c 'printf &quot;today the url is http://mydomain.com/%s&quot; &quot;`date +%Y-%m-%d`&quot;'" />

I'm still figuring out how to pass param as substitution arg (perhaps usingthe same above technique or using launch-prefix in <test> or <node> tag), tag to set environment variable in terminal from where to read), but the above might solve your problem..