* http://helm.cs.unibo.it/
*)
+(** removes a file if it exists *)
+val safe_remove: string -> unit
+
val is_dir: string -> bool (** @return true if file is a directory *)
val is_regular: string -> bool (** @return true if file is a regular file *)
val input_file: string -> string (** read all the contents of file to string *)
+val output_file: string -> string -> unit (** write string to file *)
+
+val absolute_path: string -> string
(** @return true if file is a (textual) proof script *)
val is_proof_script: string -> bool