open Arg
open Unix
open Scanf
open Printf

let main dir = 
    let _ = Printf.printf "list directory %s" dir in
    let dirfd = opendir dir in
    try
        while true do 
            let fname = readdir dirfd in
            Printf.printf "%s\n" fname
        done
    with End_of_file -> closedir dirfd


let num = Array.length Sys.argv
let _ = if num == 2 then
    begin
    (*Printf.printf "%s\n" Sys.argv.(1) *)
    main Sys.argv.(1)
    end
    else
    main "."