Freshclam is a command-line tool that is used to update the virus definitions for ClamAV, an open-source antivirus software. When you run the "freshclam" command, it connects to the ClamAV database server and downloads the latest virus definitions. These definitions are used to identify and remove malware from your system.
To use Freshclam, you must first install ClamAV on your system. Once ClamAV is installed, you can update the virus definitions by running the "freshclam" command. For example:
$ freshclam
You can also use the "--help" option to display a list of available options for the "freshclam" command:
$ freshclam --help
It is a good idea to run the "freshclam" command on a regular basis to ensure that your system is protected against the latest threats. You can also configure Freshclam to run automatically using a cron job or similar scheduling tool. Some common configurations for Freshclam include setting a proxy server, using a custom database directory, and excluding specific databases from the update process.