To run a test in verberose mode that will write a report to /var/log/clamscan.log, enter this at the command line.

clamscan -r -l /var/log/clamscan.log /

To run the same test in quiet mode, run this at the command line.

clamscan -r --quiet -l /var/log/clamscan.log /

To update clamav database, run this at the command line.

/usr/bin/freshclam --quiet -l /var/log/clamav-update.log

If you would like to have all this ran everyday, you can create a executable script and place it in the /etc/cron.daily. To put this all together follow these steps. Create logfiles

vim clamscan.log
vim clam-update.log

Create shell scripts
vim /etc/cron.daily/avscan

#!/bin/bash
# Update the database
/usr/bin/freshclam --quiet -l /var/log/clamav-update
# Scan system for viruses
clamscan -r --quiet -l /var/log/clamscan.log /

Make /etc/cron.daily/avscan executable

chmod 774 /etc/cron.daily/avscan