FWVirusScanner is a GUI front end to ClamAV. In other words, FWVirusScanner lets you do the same thing the 'clamscan' command can do in a point-and-click way. FWVirusScanner doubles not only as a standalone script that will run on it own, but as a Nautilus script meaning, once installed, can be used by right-clicking any number of files or directories in Nautilus and have them get scanned for viruses.