Andreas,

This is not a bug, but a standard issue with unix command-line
utilities.  The option parser thinks your negative one is an option.
The standard way to let the option parser know that you are done with
options is to insert a -- between the options and the arguments of a
command.  In your example, this would look like

rosservice call -- /my_controller/SetSpeed -1

On Fri, May 7, 2010 at 6:50 AM, Andreas Vogt <andreas.vogt@dfki.de> wrote:
> Hi,
>
> It would be nice to send negative values to any rosservice:
>
> rosservice call /my_controller/SetSpeed -1
> rosservice: error: no such option: -1
>
> Usage: rosservice call /service [args...]
>
> Is there an easy way to fix this?
>
> Andreas
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