+external sh : t -> string -> string = "ocaml_guestfs_sh"
+external sh_lines : t -> string -> string array = "ocaml_guestfs_sh_lines"
+external glob_expand : t -> string -> string array = "ocaml_guestfs_glob_expand"
+external scrub_device : t -> string -> unit = "ocaml_guestfs_scrub_device"
+external scrub_file : t -> string -> unit = "ocaml_guestfs_scrub_file"
+external scrub_freespace : t -> string -> unit = "ocaml_guestfs_scrub_freespace"
+external mkdtemp : t -> string -> string = "ocaml_guestfs_mkdtemp"
+external wc_l : t -> string -> int = "ocaml_guestfs_wc_l"
+external wc_w : t -> string -> int = "ocaml_guestfs_wc_w"
+external wc_c : t -> string -> int = "ocaml_guestfs_wc_c"