How to know actual size of a compressed file in ubuntu using command?

Question

I have a wikipedia dump file of around 15GB which extension is .tar.7z. In it has another .tar file. The main content has in .tar file.

How to get the original size of all files those have in the tar file?

Answer 1

.tar in .tar.7z? That's strange. If it was just two levels (.7z and .tar) you could do:

tar tvf foo.tar.7z

For example,

$ tar tvf certbot.tar.xz
drwxr-xr-x muru/muru   0 2016-07-06 19:30 certbot/
-rw-r--r-- muru/muru 362 2016-07-06 19:30 certbot/CHANGES.rst
drwxr-xr-x muru/muru   0 2016-07-06 19:30 certbot/letsencrypt-nginx/
drwxr-xr-x muru/muru   0 2016-07-06 19:30 certbot/letsencrypt-nginx/letsencrypt_nginx/
-rw-r--r-- muru/muru 119 2016-07-06 19:30 certbot/letsencrypt-nginx/letsencrypt_nginx/__init__.py
-rw-r--r-- muru/muru 11984 2016-07-06 19:30 certbot/letsencrypt-nginx/LICENSE.txt
-rw-r--r-- muru/muru   118 2016-07-06 19:30 certbot/letsencrypt-nginx/README.rst
-rw-r--r-- muru/muru  1638 2016-07-06 19:30 certbot/letsencrypt-nginx/setup.py
-rw-r--r-- muru/muru    39 2016-07-06 19:30 certbot/letsencrypt-nginx/MANIFEST.in
-rw-r--r-- muru/muru   604 2016-07-06 19:30 certbot/CONTRIBUTING.md
-rw-r--r-- muru/muru   494 2016-07-06 19:30 certbot/readthedocs.org.requirements.txt
...

As you can see, the file sizes are listed in the third column.