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The wget command in Linux and Unix-like systems is used to download files from the internet via HTTP, HTTPS and FTP protocols.

Here are a few examples of how the wget command can be used:

1. Download a single file:

   wget http://example-url/file.zip

2. Download a file and save it with a different name:

   wget -O newname.zip http://example-url/file.zip

3. Download a file and resume a stopped or incomplete download:

   wget -c http://example-url/file.zip

4. Download files from a website recursively:

   wget -r http://example-url/

5. Download files from a website with a specific extension:

   wget -r -A.zip http://example-url/

6. Download files using a proxy:

   wget --proxy=http://proxy-example-server:port http://example-url/file.zip

wget command is widely used to automate the download of files, it can be scheduled to run in the background and download files at regular intervals.

1. The -r option, you can download a whole website recursively;
2. The -A option you can specify the type of files that you want to download;
3. The -c option can be used to continue a stopped or incomplete download;
4. The -O option can be used to specify a different name for the downloaded file.

It's also possible to use wget to download files from FTP server by specifying the ftp protocol and the credentials if required, for example:

wget ftp://username:password@ftpserver/path/to/file.zip