I am studying on Docker these days and confused that why RUN pwd just does not seem to work while running my docker file.I am working on IOSand the full content of my docker file can be seen as below:FROM ubuntu:latestMAINTAINER xxxRUN mkdir -p /ln && echo hello world > /ln/wd6.txtWORKDIR /lnRUpwdCMD ["more" ,"wd6.txt"]as far as my understanding, after building the docker image with the tag 'wd8'and running it, I supposed the result should show like this~ % docker run wd8::::::::::::::wd6.txt::::::::::::::hello worldlnhowever, the fact is without ln.I have tried with RUN $pwd, and also added ENV at the beginning of my dockerfile, both do not work.Please help point out where the problem is.上面的内容是因为先在stackoverflow发帖问的，所以直接把问题内容粘贴过来了。。顺便想问一下所以是不是RUN mkdir 本机存在的一个路径+新文件夹的名字这个命令，其实我理应并不会在本机存在的这个路径下面看到这个被创建的新的文件夹，对吗