Linux /etc/security/limits.conf explaination

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http://serverfault.com – Can anyone explain (or know of a source) that provides details about the items in limits.conf? The man page doesn't give much details. For example it says: rtprio maximum realtime priority allowed for non-privileged processes (Linux 2.6.12 and higher) priority the priority to run user process with (negative values boost process priority) How are these different? What values can they take? What do they default to? Some of the items are obvious, but where can I find better explanations (default values, ranges, what they actually mean etc) of: data maximum data size (KB) fsize max (HowTos)