The /proc filesystem is used to store many system configuration parameters. It is a virtual filesystem that resides in the kernels memory. Some of the areas in this filesystem cannot be written to by the root user including /proc/sys. Much information here is based on the proc man page. Fro more information refer to that page. Elements of the proc filesystem include:
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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