Das deutsche Python-Forum

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#!/usr/bin/env python
# -*- coding: iso-8859-1 -*-

import sys
import tempfile


def unix2dos(filename):
    infile = file(filename, "rb")
    outfile = tempfile.TemporaryFile()
    for line in infile:
        line = line.replace("\r\n", "\n")
        line = line.replace("\n", "\r\n")
        outfile.write(line)
    infile.close()
    infile = file(filename, "wb")
    outfile.seek(0)
    for line in outfile:
        infile.write(line)
    infile.close()
    outfile.close()


def main():
    unix2dos(sys.argv[1])


if __name__ == "__main__":
    main()