I'd like to know how I can know the free memory left to allow a software generate a file at var directory. As far as I tested, free command did not to seem to show the exact number of free memory size even if I created and deleted a file. Although I get enough free once I reboot the livecd, I'd like to turn on the system permanently and the free size seems to fluctuate so I'm not sure how much memory I could use to generate a file.