List the contents of the files.tar tar archive.
You can use this short tar command.
              
                  tar -tvf files.tar
              
          
      Or this more verbose tar command.
              
                  tar --list --verbose --file files.tar
              
          
      -t or --list tells tar to extract an existing archivev or --verbosetells tar to produce verbose outputf or --filetells tar that the next parameter will be the tar file to create, extract, append to, list, etc.