Command line arguments to Docker CMD

July 26, 2023 by Tarik

Use ENTRYPOINT for stuff like this. Any CMD parameters are appended to the given ENTRYPOINT.

So, if you update the Dockerfile to:

FROM ubuntu:15.04
ENTRYPOINT ["/bin/bash", "-c", "cat"]

Things should work as you wish.

Also, as you don’t need the $1, you should be able to change it to:

FROM ubuntu:15.04
ENTRYPOINT ["/bin/cat"]

I haven’t tested any of this, so let me know if it doesn’t work.