+ longdesc = """
+ List the contents of some portion of the grid.
+
+ When the -l or --long option is used, each line is shown in the
+ following format:
+
+ drwx <size> <date/time> <name in this directory>
+
+ where each of the letters on the left may be replaced by '-'.
+ 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.
+ 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.
+
+ Directories have no size, so their size field is shown as '-'.
+ Otherwise the size of the file, when known, is given in bytes.
+ The size of mutable files or unknown objects is shown as '?'.
+
+ The date/time shows when this link in the Tahoe filesystem was
+ last modified.
+ """