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Eliminate ^M character using vi(Linux)

Sometimes certain characters(for eg.,^M characters)are placed in a
file during a DOS to UNIX conversion.To modify these files with a lot
of ^M symbol at the end of every line,using the vi editor,use the
following command:

:%s/^M//g

(To get the ^M hold the control key, press V then M (Both while holding the control key) and the ^M will appear.)
This
command will find all occurances and replace them with nothing.
Here,the :%s is a basic search and replace command in vi. It tells vi
to replace the regular expression between the first and second slashes
(^M) with the text between the second and third slashes (nothing in
this case). The g at the end directs vi to search and replace globally
(all occurrences).

Remove ^M characters at end of lines in vi
有一点需要注意的是，如果采用命令vi file_name将无法看到这些非法字符，也无法执行上面的替换操作，必须以binary方式打开: vi file_name -b