# Install ClamAV antivirus in Ubuntu Server and Client With Cron job
In this how to we will install [ClamAV](http://www.clamav.net) antivirus on an Ubuntu client and a server. First we will install it on the client with the following command:Install clamav packagesudo apt-get install clamav clamtk
```
sudo apt-get install clamav clamtk
```
This will install **ClamAV** and the GUI frontend [ClamTK](http://clamtk.sourceforge.net). You can configure daily scans and virus definition updates inside this tool.
To install ClamAV on an Ubuntu server we start by installing ClamAV and the **daemon** by executing the following commands:
```
sudo apt-get install clamav clamav-daemon
```
Next we need to reconfigure the ClamAV base package, update the virus definitions and start the daemon. Execute the following commands
> Reconfigure ClamAV and update virus definitions
\#set the maximum directory recursion to 50 such that all directories are getting scanned
\# set to follow directory sym links to true
```
sudo dpkg-reconfigure clamav-base
sudo freshclam
sudo /etc/init.d/clamav-daemon start
```
Next we need to create a shell script which scans a specific directory and sends an email if a virus is found. Place that shell script inside the user home of the root user or somewhere else. I placed it inside */home/clamav.* Ok now create a file with the command ***‘sudo*** ***vi clamav-scan.sh’*** and enter the following content:
**clamav-scan.sh#!/bin/sh**
```
#!/bin/sh
# emtpy the old scanlog and do a virus scan
rm -R /home/root/clamav/clamav-scan.log
touch /home/root/clamav/clamav-scan.log
clamdscan /home/ /etc/ /opt/ --fdpass --log=/home/root/clamav/clamav-scan.log --infected --multiscan
### Send the email
if grep -rl 'Infected files: 0' /home/root/clamav/clamav-scan.log
then echo "No virus found inside /home."
else cat /home/root/clamav/clamav-scan.log | mail -s "Virus warning inside folder /home" root
fi
```
Next we need to make the file executable with the following command:
> Make the clamav-scan.sh executablesudo
```
chmod +x clamav-scan.sh
```
After that we add this file as a cronjob which executes every night at 3am:
> Add the cronjob for the scan
```
sudo crontab -e
```
{% hint style="info" %}
\# enter the following line\
00 03 \* \* \* {PATH-TO-SCRIPT}/clamav-scan.sh
{% endhint %}
Substitute the *{PATH-TO-SCRIPT}* placeholder with the path where the **clamav-scan.sh** script is stored.
Next we infect the folder you want to scan with the EICAR test virus. For that create a text file and add the following content to it:
> EICAR test virus
```
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
```
Store it and then run the created **clamav-scan.sh** to see if the virus is found and the mail is sent. After everything worked as it should, delete the test virus text file.
**But be aware:** The clamav-scan.sh script identifies the viruses and doesn’t delete them, that has to be done manually.
{% hint style="info" %}
Source
{% endhint %}
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.techridez.com/techridez/devops/webdev/install-clamav-antivirus-in-ubuntu-server-and-client-with-cron-job.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.