手机上将mp4转换成amv

How to all text in a file from upper case to lower case and vice versa on ?

如何在上将文件中的所有文本从大写为小写，反之亦然？

Convert from upper case to lower case:

从大写转换为小写：

tr '[:upper:]' '[:lower:]' < input.txt > output.txt

Convert from lower case to upper case:

从小写转换为大写：

tr '[:lower:]' '[:upper:]' < input.txt > output.txt

翻译自:

手机上将mp4转换成amv