emacs改变文件编码
1.查看当前buffer的编码:M-x describe-coding-system
2.列出所有编码:C-x <RET> r <TAB>
3.以指定编码重读当前buffer:C-x <RET> r utf-8,(revert-buffer-with-coding-system)
4.改变当前buffer的编码:C-x <RET> f utf-8,(set-buffer-file-coding-system)
5.设定下一步操作的编码格式:C-x <RET> c,(universal-coding-system-argument)