On 04/20/2015 03:08 PM, Murthy Gandikota wrote: >> >>> $ tar xvf mytar.gz >>> tar: This does not look like a tar archive >>> tar: Skipping to next header >>> tar: Exiting with failure status due to previous errors >> >> Then what makes you think it is actually a tar archive? >> What >> >> gunzip> mytar < mytar.gz; file mytar >> >> says? >>
> Sorry, didn't notice the top-posting.... here is the output to the command > > mytar: gzip compressed data, last modified: Tue Mar 24 03:50:58 2015, from > Unix Then it looks like you have a DOUBLE-compressed file. That is, someone took a .tar.gz file, and ran THAT through gzip again (which seldom does anything except make a LARGER file - because the first round of compression removed any redundancy). Tar cannot read a double-compressed stream, but breaking things into two steps lets you get back to a single compressed stream, where the tar call then auto-decompresses because you weren't supplying an explicit 'z' the second time around. To prove it, try: gunzip <mytar.gz >mytar tar zxvf mytar and if it still untars with an explicit decompression, then you have proven that your original file was double-compressed. Also, if I'm right about double compression, then mytar.gz would likely be slightly larger than mytar (rather than the usual case of the .gz being noticeably smaller). -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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