CQRLOG is a very good general logging program for Linux and there is now a version that works well on the Raspberry Pi B 2:
https://www.cqrlog.com/node/1455I used it with an RPI2 running Linux Mate and it worked very well. The only reason I switched back to a desktop machine is that WINE does not work on the PI and I use it to run the W2 wattmeter software which is not available in Linux.
73 Bill NZ0T