If 'd' is present, it indicates that the object is a directory.
If the 'd' is replaced by a '?', the object type is unknown.
'rwx' is a Unix-like permissions mask: if the mask includes 'w',
- then the object is writable through its link in this directory.
+ then the object is writeable through its link in this directory
+ (note that the link might be replaceable even if the object is
+ not writeable through the current link).
The 'x' is a legacy of Unix filesystems. In Tahoe it is used
only to indicate that the contents of a directory can be listed.