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Also I wonder what happens if I let it accumulate and not clean?

Well, you run out of disk space, eventually...

You not googling is obvious, as your question directly relates to http://answers.ros.org/question/229966/does-ros-have-rolling-log-files-ability-to-limit-total-size/ :-)

About your question though:

Of course. However, this requires some manual scripting. IMO, there are two ways.

1. Write a simple script that you start via cron. You can e.g. use the find tool with the -mtime property to get the last modified time of a file and delete via this.
2. Use logrotate. However, as the log files typically get "stamped" with the RUN_ID, this will probably also need some fiddeling with the prerotate and postrotate scripts.