Naming log folder

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The 51342e8a-7f6c-11e8-a056-5404a63cee0d string is actually a parameter called run_id (you get check it by calling rosparam get /run_id) that is generated uniquely while starting roscore. This parameter should not be changed. What you can change is the path before that (/home/user/catkin_ws/src/project/logs/ in your example) by setting the $ROS_LOG_DIR environment variable. One solution that could work for you is to set this environment variable to the current time programmatically using a script before every launch. Then while collecting these logs you can write a simple script that goes inside each log folder and moves the content one directory level up.