val tail_n : t -> int -> string -> string array
(** return last N lines of a file *)
+val df : t -> string
+(** report file system disk space usage *)
+
+val df_h : t -> string
+(** report file system disk space usage (human readable) *)
+
+val du : t -> string -> int64
+(** estimate file space usage *)
+
+val initrd_list : t -> string -> string array
+(** list files in an initrd *)
+
+val mount_loop : t -> string -> string -> unit
+(** mount a file using the loop device *)
+