+external fsck : t -> string -> string -> int = "ocaml_guestfs_fsck"
+external zero : t -> string -> unit = "ocaml_guestfs_zero"
+external grub_install : t -> string -> string -> unit = "ocaml_guestfs_grub_install"
+external cp : t -> string -> string -> unit = "ocaml_guestfs_cp"
+external cp_a : t -> string -> string -> unit = "ocaml_guestfs_cp_a"
+external mv : t -> string -> string -> unit = "ocaml_guestfs_mv"
+external drop_caches : t -> int -> unit = "ocaml_guestfs_drop_caches"
+external dmesg : t -> string = "ocaml_guestfs_dmesg"
+external ping_daemon : t -> unit = "ocaml_guestfs_ping_daemon"
+external equal : t -> string -> string -> bool = "ocaml_guestfs_equal"
+external strings : t -> string -> string array = "ocaml_guestfs_strings"
+external strings_e : t -> string -> string -> string array = "ocaml_guestfs_strings_e"
+external hexdump : t -> string -> string = "ocaml_guestfs_hexdump"