Run script before getting prompt in singularity shell

Question

I have built a Docker container with a Docker file that ends with WORKDIR /where/I/will/work and when I spin up the container, I can get to work. Unfortunately, my remote system won't allow Docker containers, so I converted it to a singularity container. Everything works great, except that it drops me into a bind of my local directory, which is not where I want to be.

singularity shell --bind /different/src/dir:/a/dest/dir my_image.sif

This does almost everything I want, except for the aforementioned starting directory.

I'd like to run a script just after entering the shell that is simply cd /where/I/want/to/be. There are a couple of questions with answers that no longer work because the meaning of the -c flag has changed.

I will also accept and answer that has me make a change to the Dockerfile, but I don't know what that could be because the Docker image works like I want it to.

Answer 1

From the documentation on singularity shell, the way to get what I want is to do

singularity shell --bind /different/src/dir:/a/dest/dir --pwd /where/I/want/to/be my_image.sif

The help message has it hidden a little bit under -p/--pid and mentions payloads and such that make it seem like it does something different. I suspect that help is common with the exec command where the language would make more sense.