+option "size_unit" -
+#~~~~~~~~~~~~~~~~~~~
+"select output format for sizes"
+enum typestr="format"
+values="h","b","k","m","g","t"
+default="h"
+optional
+details="
+ Print sizes in the given unit: human-readable, bytes,
+ kilobytes (2^10), megabytes (2^20), gigabytes (2^30), terabytes
+ (2^40). The default is \"h\", i.e. human-readable.
+"
+
+option "count_unit" -
+#~~~~~~~~~~~~~~~~~~~~
+"select output format for counted values"
+enum typestr="format"
+values="h","n","k","m","g","t"
+default="h"
+optional
+details="
+ Print the number of files/directories in the given unit:
+ human-readable, number, number/10^3, number/10^6, number/10^12,
+ number/10^15. The default is to print numbers in human-readable
+ format.
+"
+
+option "user-summary-sort" -
+#~~~~~~~~~~~~~~~~~~~~~~~~~~~
+"how to sort the user-summary"
+enum typestr="col_spec"
+values="name","uid","dir_count","file_count","size"
+default="size"