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you should define it in the config file, like this

log4j.logger.ros.log_test=WARN,rosout_a log4j.appender.rosout_a=org.apache.log4j.RollingFileAppender log4j.appender.rosout_a.Threshold=WARN log4j.appender.rosout_a.Append=true log4j.appender.rosout_a.File=/home/name/output.txt

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