rcainc it's kind of you to reply but that's
exactly the same as my post. Also you have an error: mv x.tar.tar x.tar.gz ; tar xvzf x.tar.tar (but that file no longer exists, right

)
Note: `tar` doesn't care what the extension /actually/ is, you can have a tar+bzip2 file that has no extension at all as long as you pass it the correct decompression parameters.