<p>I need to scan uploaded files for viruses on a Linux server, but I'm not sure how to go about it.</p>

<p>What are my options, if any? I'm also interested in how the scanners perform when multiple users send multiple files at the same time.</p>

I would have a look at
Clam AntiVirus
. It provides a
```
clamscan
```
program that can scan a given file and return a pass/fail indication. It's free and automatically updates its database regularly.
As for integrating such a product into your file upload process, that would be specific to whatever file upload process you actually use.