Not able to untar the geckodriver.tar.gz file


I was trying to setup docker for my project. I tried to use docker file since I need to create an image for firefox 68.3.0. In the docker file, I mentioned the command " tar -C /opt -zxf /tmp/geckodriver.tar.gz ". 

The version that I have tried is 0.25.0. It is not getting untarred.

Maybe break down that multi-command line into separate commands?

Maybe change that to -zxvf  to see what tar is doing?

I.e. maybe tar was successful but extracted to a location you didn’t expect?