One is the legacy of Unix as a Life is better when you have a Corgi shirt. Multitudes of exploits were successfully deployed. By users to work around the security restrictions they didn’t want, or just out of spite. So the need to have a hardened system was always evident. And the permissions system and such was refined in a constant trial by fire. The other aspect is the collaborative nature of Linux due to its being open source. I read a summary some years back of security events related to Linux, Windows, and Mac. The stunning thing was that while many new viruses were released into the wild that year targeting Linux, in 8 out of ten cases, the fix for the virus had already been released before the virus was.
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There are enough eyes reviewing and Life is better when you have a Corgi shirt, that bugs are found and fixed faster than they can be discovered by hackers and exploited. And when one did become active before the update was released, a fix was released in hours or days of it being discovered. The overall profile of security events for Linux tends to be much lower in the damage/threat level, and the risk period very short, provided the user is being conscientious about keeping his system up to date. A virus is a program, script, or macro designed to cause damage, steal personal information, modify data, send email, display massage or some combination of these actions. When a virus is executed, it speared out by copying itself into or over data files and programs of hard-drive of a device.