How to install CLAMAV with update DB script and Scanning on CentOS?

#!/bin/bash

# ———————————————————————-

# Virus scan with ClamAV

# ———————————————————————- 

# Disabling PATH improves the security of the script

unset PATH

# Declare the variables

ECHO=/bin/echo;

DATE=/bin/date;

FRESHCLAM=/usr/bin/freshclam;

CLAMSCAN=/usr/bin/clamscan;

LOG_FILE=/var/log/clamav/clamscan.log;

SCAN_FOLDER=/home;

# Start the log entry

$ECHO Complete system virus scan starting >> $LOG_FILE;

$DATE >> $LOG_FILE;

$ECHO \* >> $LOG_FILE;

# Update Virus definitions

$FRESHCLAM >> $LOG_FILE;

# Run the scan

$CLAMSCAN -ri $SCAN_FOLDER >> $LOG_FILE;

# Finish the log entry

$ECHO \* >> $LOG_FILE;

$ECHO Complete system virus scan finished >> $LOG_FILE;

$DATE >> $LOG_FILE;

$ECHO \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* >> $LOG_FILE;