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, 2010-06-13 at 18:59 -0700, Josh Faust wrote:That is unclear from the documentation, also now that I'm looking at it
> The output will always go to the node's log file, even if you're not
> running it through roslaunch.
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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