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When DFS_USING_WORKDIR is enabled, msh will try to chdir if the command is not found. For example, if there is folder named "SD", and there is no `SD` command and `SD.mo` module, typing "SD" in msh will cd to the folder. In more detail, the execution order right now is: 1. built-in command 2. module 3. cd to path If you have a folder named "ps", you have to run `cd ps` to change the working dir.