Is there a wiki extension for me see all contents my /data pariton for eg?
I just need to see everything available in /data. /home/user etc from xwiki interface
All you need is some short groovy script (needs programming rights ofc since otherwise it would be a security violation :)).
See for example https://snippets.xwiki.org/xwiki/bin/view/Extension/Show%20Log to give you an idea (you’ll need to adjust this).