#!/usr/bin/env python
import optparse
import os

def main():
    p = optparse.OptionParser(description="Python 'ls' command clone",
                                prog="pyls",
                                version="0.1a",
                                usage="%prog [directory]")
    options, arguments = p.parse_args()
    if len(arguments) == 1:
        path = arguments[0]
        for filename in os.listdir(path):
            print filename
    else:
        p.print_help()
if __name__ == '__main__':
    main()