ISO file cut

Stephen R Laniel steve at
Wed Apr 26 13:07:20 UTC 2006

On Wed, Apr 26, 2006 at 05:52:00PM +0430, Mehdi Hassanpour wrote:
> Is there any application that can cut an image ISO file into 2 seperate files
> then again match them together to have the image file back ?

If you're not particularly concerned about where you cut it,
you could just use 'dd'. (Man page included below, just

DD(1)								     User Commands								  DD(1)

       dd - convert and copy a file

       dd [OPTION]...

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

	      force ibs=BYTES and obs=BYTES

	      convert BYTES bytes at a time

	      convert the file as per the comma separated keyword list

	      copy only BLOCKS input blocks

	      read BYTES bytes at a time

	      read from FILE instead of stdin

	      write BYTES bytes at a time

	      write to FILE instead of stdout

	      skip BLOCKS obs-sized blocks at start of output

	      skip BLOCKS ibs-sized blocks at start of input

       --help display this help and exit

	      output version information and exit

       BLOCKS and BYTES may be followed by the following multiplicative suffixes: xM M, c 1, w 2, b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB
       1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y.  Each KEYWORD may be:

       ascii  from EBCDIC to ASCII

       ebcdic from ASCII to EBCDIC

       ibm    from ASCII to alternated EBCDIC

       block  pad newline-terminated records with spaces to cbs-size

	      replace trailing spaces in cbs-size records with newline

       lcase  change upper case to lower case

	      do not truncate the output file

       ucase  change lower case to upper case

       swab   swap every pair of input bytes

	      continue after read errors

       sync   pad every input block with NULs to ibs-size; when used

	      with block or unblock, pad with spaces rather than NULs

       Note that sending a SIGUSR1 signal to a running dd process makes it print to standard error the number of records read  and  written  so  far,
       then to resume copying.

	      $ dd if=/dev/zero of=/dev/null& pid=$!
	      $ kill -USR1 $pid; sleep 1; kill $pid

	      10899206+0 records in 10899206+0 records out

       Written by Paul Rubin, David MacKenzie, and Stuart Kemp.

       Report bugs to <bug-coreutils at>.

       Copyright  2004 Free Software Foundation, Inc.
       This  is  free  software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR

       The full documentation for dd is maintained as a Texinfo manual.  If the info and dd programs are properly installed at your site, the command

	      info coreutils dd

       should give you access to the complete manual.

dd (coreutils) 5.2.1						       July 2004								  DD(1)

Stephen R. Laniel
steve at
Cell: +(617) 308-5571
PGP key:
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
URL: <>

More information about the ubuntu-users mailing list