+(** {2 Optional values} *)
+
+val map_option: ('a -> 'b) -> 'a option -> 'b option
+val iter_option: ('a -> unit) -> 'a option -> unit
+val unopt: 'a option -> 'a (** @raise Failure *)
+
+(** {2 Filesystem} *)
+
+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 mkdir: string -> unit (** create dir and parents. @raise Failure *)
+val tilde_expand: string -> string (** bash-like (head) tilde expansion *)
+val safe_remove: string -> unit (** removes a file if it exists *)
+val safe_rmdir: string -> unit (** removes a dir if it exists and is empty *)
+val is_dir_empty: string -> bool (** checks if the dir is empty *)
+val rmdir_descend: string -> unit (** rmdir -p *)
+
+
+ (** find all _files_ matching test under a filesystem root *)
+val find: ?test:(string -> bool) -> string -> string list
+
+(** {2 File I/O} *)
+
+val input_file: string -> string (** read all the contents of file to string *)
+val input_all: in_channel -> string (** read all the contents of a channel *)
+val output_file: filename:string -> text:string -> unit (** other way round *)
+
+(** {2 Exception handling} *)
+
+val finally: (unit -> unit) -> ('a -> 'b) -> 'a -> 'b
+
+(** {2 Char processing} *)
+
+val is_alpha: char -> bool
+val is_blank: char -> bool
+val is_digit: char -> bool
+val is_alphanum: char -> bool (** is_alpha || is_digit *)
+
+(** {2 String processing} *)
+
+val split: ?sep:char -> string -> string list (** @param sep defaults to ' ' *)
+val trim_blanks: string -> string (** strip heading and trailing blanks *)
+
+(** {2 List processing} *)
+
+val list_uniq:
+ ?eq:('a->'a->bool) -> 'a list -> 'a list (** uniq unix filter on lists *)
+val filter_map: ('a -> 'b option) -> 'a list -> 'b list (** filter + map *)
+val list_concat: ?sep:'a list -> 'a list list -> 'a list (**String.concat-like*)
+val list_findopt: ('a -> 'b option) -> 'a list -> 'b option
+
+(** {2 Debugging & Profiling} *)
+