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technology/applications/clamav.md

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+---
+obj: application
+os: linux
+arch-wiki: https://wiki.archlinux.org/title/ClamAV
+website: https://www.clamav.net/
+---
+#refactor 
+# ClamAV
+[Arch Wiki](https://wiki.archlinux.org/title/ClamAV)
+Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. Because ClamAV's main use is on file/mail servers for [Windows](../windows/Windows.md) desktops, it primarily detects [Windows](../windows/Windows.md) viruses and malware with its built-in signatures.
+
+## Usage
+### Updating database
+Update the virus definitions with:
+```shell
+freshclam
+```
+
+The database files are saved in:
+```
+/var/lib/clamav/daily.cvd
+/var/lib/clamav/main.cvd
+/var/lib/clamav/bytecode.cvd
+```
+
+Start/Enable`clamav-freshclam.service` so that the virus definitions are kept recent.
+
+### Starting the daemon
+
+**Note:**
+-   You will need to run `freshclam` before starting the service for the first time or you will run into trouble/errors which will prevent ClamAV from starting correctly.
+-   The daemon is not needed if you only want to perform stand-alone scans. See [Scan for viruses](https://wiki.archlinux.org/title/ClamAV#Scan_for_viruses) below.
+
+The service is called `clamav-daemon.service`.