Re: [Trinux-talk] Splitting a file

[<jc...@co...>]

Thanks for your answer Matthew,

I'm already using dd. Trouble is that I'd have to do like
      dd if=3D/dev/hda skip=3D0k count=3D500k | gzip -c
/mnt/backup/image.hda.part1.gz
      dd if=3D/dev/hda skip=3D500k count=3D500k | gzip -c
/mnt/backup/image.hda.part2.gz
      dd if=3D/dev/hda skip=3D1000k count=3D500k | gzip -c
/mnt/backup/image.hda.part3.gz
      dd if=3D/dev/hda skip=3D1500k count=3D500k | gzip -c
/mnt/backup/image.hda.part4.gz
      dd if=3D/dev/hda skip=3D2000k count=3D500k | gzip -c
/mnt/backup/image.hda.part5.gz
      dd if=3D/dev/hda skip=3D2500k count=3D500k | gzip -c
/mnt/backup/image.hda.part6.gz
      dd if=3D/dev/hda skip=3D3000k count=3D500k | gzip -c
/mnt/backup/image.hda.part7.gz
      ...and so forth...

which seems a bit cumbersome. It'd be better if the split command or
something similar was available. Then I'd be able to do like this
      dd if=3D/dev/hda | gzip -c | split -b 1900m - /mnt/backup/images.=
hda.gz

Only the split command doesn't seem to be available in Trinux - or at l=
east
I haven't found the right package yet.

/J=F8rn



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                      Matthew Franz                                    =
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                      <mf...@ci...>                  To:       jco=
@cornelius-olsen.dk                                                    =
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                      Sent by:                            cc:       tri=
nux...@li...                                         =
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                      tri...@li...        Subject:  Re:=
 [Trinux-talk] Splitting a file                                        =
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                      ceforge.net                                      =
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                      09-07-2003 19:19                                 =
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On Wed, Jul 09, 2003 at 06:52:34PM +0200, jc...@co... wrote:=

> Hi,
>
> I'm using Trinux to back up Windows workstations by imaging the disk
drive
> with dd and sending the result to the backup server over Samba. Troub=
le
is
> that Samba chokes on files larger than 2 GB. Therefore I'm trying to =
find
> out how to split the piped result into several files. Which command,
> available in Trinux, would I use for that and which package is it in?=

>
> Any help appreciated. Thanks.
>
>

You should be able to use the count and seek options with dd to do
this. The dd in the fileutil.tgz package should have the full (GNU)
version of dd (vs. a busybox version).


from man dd

       Copy  a  file,  converting and formatting according to the
       options.

       bs=3DBYTES
              force ibs=3DBYTES and obs=3DBYTES

       cbs=3DBYTES
              convert BYTES bytes at a time

       conv=3DKEYWORDS
              convert the file as per the comma separated keyword
              list

       count=3DBLOCKS
              copy only BLOCKS input blocks

       ibs=3DBYTES
              read BYTES bytes at a time

       if=3DFILE
              read from FILE instead of stdin

       obs=3DBYTES
              write BYTES bytes at a time

       of=3DFILE
              write to FILE instead of stdout

       seek=3DBLOCKS
              skip BLOCKS obs-sized blocks at start of output

       skip=3DBLOCKS
              skip BLOCKS ibs-sized blocks at start of input






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