pax

Hi.
pax -xpax -wf file.tar file
file.tar - ustar format instead of pax.

pax -o listopt="%M" <file.tar
?rw-r--r--
It must be
-rw-r--r--

Example from posix pax manual
Using the option:

-o listopt="%M %(atime)T %(size)D %(name)s"
overrides the default output description in Standard Output

pax -o listopt="%M %T %D %s" <file.tar
?rw-r--r-- 2025-12-12T03:23:14 %D 6419

Regards.