How do you list the contents of a tar file in a tar file? Until recently, I had to untar the file then use tar tf to list the contents of the embedded tar file. To my surprise I found that Vim can actually list the contents of a tar file via it's dired feature. Atom (https://atom.io), can list the contents of tar files as well.
Midnight Commander can list the contents of a tar file in a tar file.
What is Midnight Commander? It is an old school text based UI to manage files. It's roots are from MS-DOS. Yikes! It's easy to install via the command:
sudo apt install mc
Midnight Commander can do a lot of stuff. If you need to see the contents of a tar file in a tar file, this is the simplest way to do it.