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My tar man page says that the "-J" option is a synonym for --xz. I presume you should try to replace the "-J" option with "-x -z", since it's unlikely to support "--xz" if it doesn't support "-J". "-x" simply means extract the files, "-z" says to use gunzip in the process. Try it out; you'll know pretty soon if it works or not. It can't hurt anything if it doesn't.
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