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  • btw, I know how to do things like cat file.tar.00 file.tar.01 file.tar.02 | tar xf - Commented Feb 2, 2017 at 0:52
  • Then what is your practical use that you can't do by yourself? Do note that truncating a file as you read it would imply rewriting the whole remains of the file after every segment you read, thus extremely slow. Commented Feb 2, 2017 at 0:55
  • If the split files don't have odd sizes, you can do it loop devices and concatenate them with device mapper linear target. If they do have odd sizes, you need a user space block device or filesystem - fuse and nbd can be used for those. mdadm build linear might work too, never tried it. Commented Feb 2, 2017 at 1:55