[REBOL] Can't TAR TAR

[stirling]

I'm trying to get REBOL unpacked in cgi-bin on a linux remote
web-hosting server. 

After typing:
  tar -gunzip -xvf rebol042_tar.tar

This error message occurs:
  Hmm, this doesn't look like a tar archive
  Skipping to next file header
  Only read 10055 bytes from archive rebol042_tar.tar
  Error is not recoverable: existing now

I tried using tar to pack and unpack another file on the linux server
and it worked fine.

How can I get rebol to unzip?  Thanks in advance.

Stirling