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 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 *)