val fsck : t -> string -> string -> int
(** run the filesystem checker *)
+val zero : t -> string -> unit
+(** write zeroes to the device *)
+
+val grub_install : t -> string -> string -> unit
+(** install GRUB *)
+
+val cp : t -> string -> string -> unit
+(** copy a file *)
+
+val cp_a : t -> string -> string -> unit
+(** copy a file or directory recursively *)
+
+val mv : t -> string -> string -> unit
+(** move a file *)
+
+val drop_caches : t -> int -> unit
+(** drop kernel page cache, dentries and inodes *)
+
+val dmesg : t -> string
+(** return kernel messages *)
+