CMS with unix interaction capabilities

Question

Hello,

I'm looking for a decent CMS with basically 4 requirements:

1. the ability to "interact" with the unix system behind. That is: invoking other programs, creating directories, creating dynamic page contents based on some output... (therefore, some embedded scripting ability)
2. A login system and an easy way to add/remove/edit pages ...ideally editable with both WYSIWYG and raw HTML
3. Hierarchical navigation to any depth
4. Easily editable "templates" where it is easy to integrate additional javascript etc.

The requirement "1" seems obviously the bottleneck.

Any good suggestions?