dumpsort.py
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	#!/usr/bin/env python

	# Script: dumpsort.py
	# Purpose: sort the snapshots in a LAMMPS dump file by atom ID
	# Syntax: dumpsort.py oldfile N newfile
	# oldfile = old LAMMPS dump file in native LAMMPS format
	# N = column # for atom ID (usually 1)
	# newfile = new sorted LAMMPS dump file
	# Author: Steve Plimpton (Sandia), sjplimp at sandia.gov

	import sys,os
	path = os.environ["LAMMPS_PYTHON_TOOLS"]
	sys.path.append(path)
	from dump import dump

	if len(sys.argv) != 4:
	raise StandardError, "Syntax: dumpsort.py oldfile N newfile"

	oldfile = sys.argv[1]
	ncolumn = int(sys.argv[2])
	newfile = sys.argv[3]

	d = dump(oldfile)
	d.map(ncolumn,"id")
	d.sort()
	d.write(newfile)