+
+val string_find : string -> string -> int
+(** [string_find str sub] finds the index of [sub] in [str]. If
+ not found, returns -1. *)
+
+val isspace : char -> bool
+val triml : ?test:(char -> bool) -> string -> string
+val trimr : ?test:(char -> bool) -> string -> string
+val trim : ?test:(char -> bool) -> string -> string
+(** Trim strings at left, right or both. *)
+
+val absolute_path : string -> string
+(** Convert any path into an absolute path. *)