computer virus
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(with a Unix-based file system and kernel).[17] The number of viruses for the older Apple operating systems, known as Mac OS Classic, varies greatly from source to source, with Apple stating that there are only four known viruses, and independent sources stating there are as many as 63 viruses. Virus vulnerability between Macs and Windows is a chief selling point, one that Apple uses in their Get a Mac advertising.[18] In January 2009, Symantec announced discovery of a trojan that targets Macs.[19] This discovery did not gain much coverage until April 2009.[19]
Windows and Unix have similar scripting abilities, but while Unix natively blocks normal users from having access to make changes to the operating system environment, older copies of Windows such as Windows 95 and 98 do not. In 1997, when a virus for Linux was released – known as “Bliss” – leading
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