[Gllug] Splitting files at 2GB barrier

[Chris Jones]

Hi

Richard Cottrill wrote:
>     for i in 1 2 3 4 5 6 7 8 9 ; do
>         gzip --best | dd of=<mounted smb share>/image.part${i}.gz
>     obs=1000000 count=2000 ;
>     done < cat /dev/hda

tbh I'd skip the gzipping, if only because it makes this much easier on
the eye:

for i in $(seq 0 9) ; do
  dd if=test.bin of=out${i}.bin bs=1MB skip=${i} count=1
done

(perhaps doing of=- and then piping it into "gzip --best
>out${i}.bin.gz" if you really want to do the compression)

things to note here:
 * I set bs to 1MB (1000x1000 in dd) where you want 2GB
 * the loop must start at 0 rather than 1 so skip= works

then to restore it you'd just do:

for i in $(seq 0 9) ; do
  cat out${i}.bin >>restore.bin
done

I'm wondering if you could get away with:

cd /mnt/smb ; split --bytes=2000000000 /dev/hda out

but I'm not sure if split is safe on binary files and I trust dd :)

Cheers,
-- 
Chris Jones
  cmsj at tenshu.net
   www.tenshu.net
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