"One of the most common questions I hear new Linux users ask is "What program should I use for virus protection?" Many of them lose faith in me as a source of security information when I reply, "None." But you really don't need to fear malware on your new platform, thanks to the way Linux is built.
Permissions on Linux are universal. They cover three things you can do with files: read, write, and execute. Not only that, they come in three levels: for the root user, for the individual user who is signed in, and for the rest of the world. Typically, software that can impact the system as a whole requires root privileges to run.
So Linux is bulletproof? No. Bulletproof is one of the last stages of drunkenness, not a state of security. Linux users, like users on every operating system, must always be aware of security issues. They must act intelligently to keep their systems safe and secure. They should not run programs with root privileges when they are not required, and they should apply security patches regularly.
Misleading claims and false advertising by virus protection rackets to the contrary, you simply don't need antivirus products to keep your Linux box free of malware."
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