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Distribution: Open SUSE 11, Ubuntu 9.04, Fedora 11, Slackware 12.1
Oh I see, thanks for all the help. By free the RAM I mean that when you open and close out some programs, after a while in XP my available RAM goes down, so I use a utility to release all available memory. So that may also be the case for Linux as well then, which will help my old pentium III, 500mhz, with only 384 MB of RAM.
Read the article referenced above. Covers the general case - usually memory being "full" is not a problem in Linux; it's designed to work that way. However if you have a memory leak, the only way to "fix" this is to terminate the offending process as mentioned.
Firefox for example is a pig - on my small (256 Meg) system, I have gotten into the habit of closing it occasionally.
Search for "top" and "free" commands for a bit of background - and, of course, try the manpages.