Dos和Unix的换行转换_convert file to uninx line-优快云博客

DOS and UNIX end-of-line characters

The UNIX end-of-line character is a line feed/newline character (/n). The DOS/Windows end-of-line character is a carriage return, followed by a line feed/newline (/r/n).

Most editors can automatically convert these to the appropriate format, but others, such as Notepad in Windows, cannot.

To convert a UNIX file to DOS using sed (GNU sed 3.02.80 or later):
$ sed 's/$//r/' UNIX_file > DOS_file

To convert a DOS file to UNIX file, use tr to remove the carriage return:
$ tr -d '/r' < DOS_file > UNIX_file

To accomplish the same thing using sed:
$ sed 's/^M//' DOS_file > UNIX_file

Note: To generate the ^M above, press Ctrl-V, then Ctrl-M.

FTP's ASCII transfer mode will automatically do the end-of-line conversion between DOS and UNIX systems.

Also, the commands dos2unix and unix2dos may be used to perform the conversion, if present on your system.

Emacs

You can also convert a DOS file named dosfile.txt to a Unix text file using Emacs, a Unix text editor. Enter at the Unix shell prompt:
```
  emacs dosfile.txt
```
This will open the file in the Emacs text editor. To remove all the "^M" characters, type
```
  M-% C-q C-m RET RET !
```
It may also be necessary to remove a Ctrl-z at the end of the document. To quickly get to the end of the document in Emacs, type
```
  M->
```
If you see a Ctrl-z at the end of the document, delete it.

To convert a Unix file named unixfile.txt to a DOS text file, first open it in Emacs. At the Unix shell prompt, enter
```
  emacs unixfile.txt
```
This will open the file in the Emacs text editor. To add carriage returns, which will show up as ^M in Emacs, type
```
  M-% C-q C-j RET C-q C-m C-q C-j RET !
```
It may also be necessary to add a Ctrl-z at the end of the document. At the very end of the document, press
```
  C-q C-z
```