SSH is not only the secure replacement for rlogin, rsh and telnet, which has been used in the past to do remote administration work, but there are also neat tricks like port forwarding, vpn tunneling and file transfers that you can do with minimal configuration work, leaving only one port open to the internet.read full article..
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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