makes the contents of the directories and files archived in the given Unix/POSIX
visible in the name space under
They can then be accessed in an obvious way by other commands
Only read access is supported.
User and group names are taken from the ``ustar'' headers when present. Otherwise, the numeric user and group IDs are used.
options cause the
name space to be placed after or before the current contents of
the default is to replace that directory's contents.
causes permissions in the tar file to be discarded.