How to show numerical UIDs/GIDs stored in tar file

I've got some troubles with a tar file that holds a backup. It was provided by our hosting provider and contains some strange file permissions.

When viewing with

tar tvf example.tar

I only get the symbolic owner information of each file (which do not match existing users in /etc/passwd). Now I want to investigate whether the numerical values, which should also be stored inside the tar, hold the correct values. Is there a convenient way to do so?

thx

Solution 1:

There is the --numeric-owner switch that gives the information that you want

tar --numeric-owner -tvf example.tar

--numeric-owner

          always use numbers for user/group names