To download a large ISO image that is password protected in Linux, you can use the "wget" command with the "--http-user" and "--http-password" options.
For example, to download an ISO image from a URL with the username "user" and password "password", you can use the following command:
wget --http-user=user --http-password=password http://example.com/image.iso
This will download the ISO image to the current directory.
If the ISO image is hosted on a FTP server, you can use the "ftp" command with the "-u" option to specify the username and password. For example:
ftp -u ftp://user:password@example.com/image.iso
This will download the ISO image to the current directory.
Note: Make sure you have sufficient disk space to download the ISO image. The ISO image may be large, and you will need enough space to store it on your system.