Different log file... every node outputs its own log file separate from the roslaunch one (http://www.ros.org/wiki/roscpp/Overview/Logging#Output).

Josh

On Sun, Jun 13, 2010 at 7:08 PM, Bill Morris <morris@ee.ccny.cuny.edu> wrote:
On Sun, 2010-06-13 at 18:59 -0700, Josh Faust wrote:
> The output will always go to the node's log file, even if you're not
> running it through roslaunch.

That is unclear from the documentation, also now that I'm looking at it
I am pretty sure the logs end up in ~/.ros/log not $ROS_ROOT/log

http://www.ros.org/wiki/roslaunch/XML/node

output="log|screen"(optional)

     * If 'screen', stdout/stderr from the node will be sent to the
       screen. If 'log', the output will be sent to a log file in
       $ROS_ROOT/log. The default is 'log'.


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