How to list all directories and files inside docker container?

Question

Following is my dockerfile:

FROM python:3.6.5-windowsservercore
COPY . /app
WORKDIR /app
RUN pip download -r requirements.txt -d packages

To get list of files in the image, I have tried both the following options, but there is error:

encountered an error during CreateProcess: failure in a Windows system call: 
The system cannot find the file specified. (0x2) extra info: 
{"CommandLine":"dir","WorkingDirectory":"C:\\app"......

1. Run docker run -it <container_id> dir
2. Modify the dockerfile and add CMD at end of dockerfile - CMD ["dir"], then run docker run <container_id> dir

How to list all directories and files inside docker?

Answer 1

This is what I found helpful in the end. Thanks to Nischay for leading the way. The great thing about this, of course, is that one may examine the files even if the publish fails at a later stage.

# Copy everything...
COPY . ./
# See everything (in a linux container)...
RUN dir -s    
# OR See everything (in a windows container)...
RUN dir /s