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There are anti viruses that run on GNU/Linux like ClamAv and kaspersky but they actually do not target the machine they run on or at least they are not so useful. Their intention is to stop the spread of malware.
In general, you just need to install softwaref uaong the package manager from trusted sources that are usually the defaults of your distribution and not input your password when you are not expecting it.
When copying commands to the terminal, most terminals will warn you if you are copying a command that requires root privileges.
That said for the operating system, apply it to the browser as well by being eclectic on what extensions you install and voila. 99.99% guaranteed malware free.
A very good point I forgot! Only use trusted software repositories!