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The ros logging macros (rosconsole) use log4cxx and are compatible with log4j configuration files.
It's probably possible to write a configuration file that does what you want, but the documentation is pretty thin: http://logging.apache.org/log4cxx/usa...
This might not be the best way to do this, but this is what comes to my mind:
$ rosrun sample_pkg sample_node 2>&1 | grep -e "\[ERROR\]" -e "\[FATAL\"] > /path/to/file
Alternatively, you can pipe all messages written to stderr to a file. This includes all ROS WARN, ERROR and FATAL messages: (ref)
$ rosrun sample_pkg sample_node 2>/path/to/file
Asked: 2016-05-13 11:59:48 -0500
Seen: 1,267 times
Last updated: May 13 '16
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