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	#!/usr/bin/env python

	import os,thread,sys,string,time,glob

	from Tkinter import *
	from tkMessageBox import askokcancel
	from tkMessageBox import showerror
	from tkFileDialog import asksaveasfilename
	from tkFileDialog import askopenfilename

	from numpy import *

	from pNbody import *
	from pNbody import param
	from pNbody import io
	from pNbody import geometry as geo

	import Ptools as pt

	try:
	from optparse import OptionParser
	except ImportError:
	from optik import OptionParser



	########################################
	#
	# parser
	#
	########################################



	def parse_options():

	usage = "usage: %prog [options] file"
	parser = OptionParser(usage=usage)

	parser = pt.add_units_options(parser)
	parser = pt.add_ftype_options(parser)

	parser.add_option("--exec",
	action="store",
	dest="execline",
	type="string",
	default = None,
	help="give command to execute before",
	metavar=" STRING")

	(options, args) = parser.parse_args()

	if len(args) == 0:
	print "you must specify a filename"
	sys.exit(0)

	files = args

	return files,options








	################################################################################
	#
	# MAIN
	#
	################################################################################

	files,options = parse_options()
	execline = options.execline


	for file in files:
	nb = Nbody(file,ftype=options.ftype)
	if execline != None:
	exec(execline)