Windows和Linux存在文件格式的差异，当我们将一个Windows的文本传给linux后，vi这个文本可能会发现每行结尾都有一个^M。如何消除这个差异，linux为我们提供了dos2unix这个工具，如果要将linux文本转换为windows文本，则需要unix2dos


# dos2unix --help
dos2unix Copyright (c) 1994-1995 Benjamin Lin
  Copyright (c) 1998 Bernd Johannes Wuebben (Version 3.0)
  Copyright (c) 1998 Christian Wurll (Version 3.1)
Usage: dos2unix [-hkqV] [-c convmode] [-o file ...] [-n infile outfile ...]
 -h --help give this help
 -k --keepdate keep output file date
 -q --quiet quiet mode, suppress all warnings
  always on in stdin->stdout mode
 -V --version display version number
 -c --convmode conversion mode
 convmode ASCII, 7bit, ISO, Mac, default to ASCII
 -l --newline add additional newline in all but Mac convmode
 -o --oldfile write to old file
 file ... files to convert in old file mode
 -n --newfile write to new file
 infile original file in new file mode
 outfile output file in new file mode

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