I use Yii command line inside web Root folder (C:\xampp\htdocs\myapps\cmd.exe). My command looks like this:
D:\xampp\htdocs\YiiRoot\framework\yiic shell
normally it will works, but now it didn’t; I just get no output:

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Sorry for late answer.
Have you configured access rules since last time you used it? If index.php isn’t accessible without login anymore, the yiic tool will fail. You can overcome that by specifying the path to the config file: