From thi spage: http://tikiwiki.org/tiki-index.php?page=TikiMods
For being able to move files around in tikiwiki file tree, apache user needs to be granted the right to do so, which shouldn't be the normal setting. You can enable that permission setting by
* ./setup.sh www-data all
or nobody, apache or anything instead of www-data, as far as it matches with the apache user
* ./fixperms.sh open
After mods operation, the perms have to be setup back to the previous state, which depends your environment.
* ./fixperms.sh fix
and when requested give the name of the files owner, which depends if you use CVS.
Note that Windows users don't have to bother with perms.