It should be easier to download xwiki from command line (on a server)

When you go to the download page, the default option is a jar file which (if I understand properly) is a graphical installer, this is not appropriate for a server, you need the .zip instance.
When you select the .zip instance, you get a URL as follows

http://www.xwiki.org/xwiki/bin/view/DownloadCode/DownloadFeedback?downloadLink=http://download.forge.ow2.org/xwiki/xwiki-enterprise-jetty-hsqldb-7.3.zip&projectType=Stable&projectVersion=7.3&projectID=1

In order to create the correct wget command to download xwiki to your server, you need to extract the actual download link from this URL

wget http://download.forge.ow2.org/xwiki/xwiki-enterprise-jetty-hsqldb-7.3.zip

One solution is to produce URLs in links which are "correct" for downloading with wget/curl on a server and using javascript to redirect the user to the appropriate page or add a section to the download page which allows someone to download on a server.