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ClamAV is a common antivirus tool. You can install it by running:
sudo apt-get install clamav clamav-daemon
To update the virus definition database, run: freshclam To scan a directory, run
clamscan /path/to/files
Though, my question to you would be what exactly you are trying to protect yourself from? Viruses are probably not the biggest risk to your server. One of the best things you can do to protect your server is to disable password access and only use SSH keys. Check out:
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