Untaring *.tar.tar files

Hi all,
How to untar a file with .tar.tar extension. A utility that i downloaded from net had this extension.

Thanks in advance,
bubeshj.

Run tar on the file once. If the file that gets extracted still has the .tar extension, run tar again.

When i run tar once i get the following message.
Tar: tape blocksize error

Thanks in advance,
bubeshj

Make sure that the file you have is really a tar archive. Check this by using the command 'file <filename>'. This will tell you what type of file it is, so that you can take the necessary action.

its a gzip compressedd file.Any suggestions on how to untar it.
Thanks,
Bubeshj

use gunzip

use the following command

gunzip -c <archive> | tar tvf -