Linux is undoubtedly much more secure than windows or mac systems. Now there exist a misconception that linux systems cannot be affected by virus. Linux systems are prone to virus attacks like any other operating systems. It is just that linux has much better access controls and permissions when compared to others. In linux a file is not in execute mode by default which considerably reduces the chances to virus attacks. A file in execute mode is called a script in linux but otherwise a file is not in its execute mode even if created by the super user until its permission is manually changed.
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