I won’t go into details about why anti-virus software is essential on any platform. I assume you are already knowledgeable and thus are looking for solutions. As an active Linux user my recommendations are below.

1. Sophos Anti-Virus

Sophos includes a virus, trojan and malware scanner. There is on demand and real-time scanning. Sophos not only detects Linux baddies but also prevents and removes Windows, Android and MacOS malware too. This Anti-Virus gets high marks for high performance, lightweight footprint, wide platform compatibility and it’s FREE!
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