拿到一份文档，里面全是大写字母，要全部改写成为小写字母，印象里写段小程序判断ACSII码范围然后增减一个数值就可以搞定，但是最近比较迷VIM，就顺带搜索了一下能否有现成的命令或脚本解决，没想到还真找到了。
gggUG—-全文转换为大写字符。
ggguG—-全文转换为小写字符。
最后一个“G”代表范围，通过调整这个可以限定字、行、正文范围的转换。
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