On debian if not installed (my case) you can do the following in your terminal :
sudo apt-get install wget
Then you can get your specific file like thisĀ :
wget http://www.sevenacross.com/photos.zip
Have a look to this blog post here for more details : http://www.simplehelp.net/2008/12/11/how-to-download-files-from-the-linux-command-line/