While Linux is more secure against an invasion over the Internet, more is not necessarily enough. A firewall, software that allows you fine-grained control over your connection in and out of your computer, is the next step in increasing security. While Linux has had built-in firewalling software for many years, configuration of that software was a combination of a lot of research and some cryptic commands.
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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