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ISO file creation -- procedure

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# 1  
Old 08-28-2009
ISO file creation -- procedure
Hi All,

Am creating ISO file for same directory two times and both has different md5sum, Why does it so ?!

Am pretty sure that, there is no change in that directory between the ISO creations, So what could be issue ? Or is there any misunderstanding in the process.

Code:
mkisofs -J -R -otest1.iso ./testdir
mkisofs -J -R -otest2.iso ./testdir

Expecting both the md5sum to be same !! but it is not ??

Code:
$ md5sum test?.iso
2a1001de29b75013d1bb5a8a787cf2ef  test1.iso
d01b9b1120ec6662d582dc3af6f94338  test2.iso

Side Note: I have related question posted already here, which dont had answer, so tried other ways and the above is one of the doubt in other way... https://www.unix.com/unix-advanced-ex...-iso-file.html
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LEARN ABOUT SUNOS

iconv_646

iconv_646(5)						Standards, Environments, and Macros					      iconv_646(5)

NAME

       iconv_646 - code set conversion tables for ISO 646

DESCRIPTION

       The following code set conversions are supported:

       +-----------------------------------------------------------------------+
       |		    Code Set Conversions Supported		       |
       +----------+---------------+--------------+--------+--------------------+
       |  Code	  |    Symbol	  |Target Code	 |Symbol  |   Target Output    |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646   | 646 	  |ISO 8859-1	 |8859	  |US ASCII	       |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646de | 646de	  |ISO 8859-1	 |8859	  |German	       |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646da | 646da	  |ISO 8859-1	 |8859	  |Danish	       |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646en | 646en	  |ISO 8859-1	 |8859	  |English ASCII       |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646es | 646es	  |ISO 8859-1	 |8859	  |Spanish	       |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646fr | 646fr	  |ISO 8859-1	 |8859	  |French	       |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646it | 646it	  |ISO 8859-1	 |8859	  |Italian	       |
       +----------+---------------+--------------+--------+--------------------+
       |ISO 646sv | 646sv	  |ISO 8859-1	 |8859	  |Swedish	       |
       +----------+---------------+--------------+--------+--------------------+

CONVERSIONS

       The conversions are performed according to the following tables. All values in the tables are given in octal.

   ISO 646 (US ASCII) to ISO 8859-1
       For the conversion of ISO 646 to ISO 8859-1, all characters in ISO 646 can be mapped unchanged to ISO 8859-1

   ISO 646de (GERMAN) to ISO 8859-1
       For the conversion of ISO 646de to ISO 8859-1, all characters not in the following table are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 646de    |  ISO 8859-1	|  ISO 646de	 |  ISO 8859-1	 |
       |100	       | 247		|173		 |344		 |
       |133	       | 304		|174		 |366		 |
       |134	       | 326		|175		 |374		 |
       |135	       | 334		|176		 |337		 |
       +---------------+----------------+----------------+---------------+

   ISO 646da (DANISH) to ISO 8859-1
       For the conversion of ISO 646da	to ISO 8859-1, all characters not in the following table are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 646da    |  ISO 8859-1	|  ISO 646da	 |  ISO 8859-1	 |
       |133	       | 306		|173		 |346		 |
       |134	       | 330		|174		 |370		 |
       |135	       | 305		|175		 |345		 |
       +---------------+----------------+----------------+---------------+

   ISO 646en (ENGLISH ASCII) to ISO 8859-1
       For the conversion of ISO 646en to ISO 8859-1, all characters not in the following table are mapped unchanged.

       +-----------------------------------------------------------+
       |		  Conversions|Performed 		   |
       |	 ISO 646en	     |	       ISO 8859-1	   |
       |043			     |243			   |
       +-----------------------------+-----------------------------+

   ISO 646es (SPANISH) to ISO 8859-1
       For the conversion of ISO 646es to ISO 8859-1, all characters not in the following table are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 646es    |  ISO 8859-1	|  ISO 646es	 |  ISO 8859-1	 |
       |100	       | 247		|173		 |260		 |
       |133	       | 241		|174		 |361		 |
       |134	       | 321		|175		 |347		 |
       |135	       | 277		|		 |		 |
       +---------------+----------------+----------------+---------------+

   ISO 646fr (FRENCH) to ISO 8859-1
       For the conversion of ISO 646fr to ISO 8859-1, all characters not in the following table are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 646fr    |  ISO 8859-1	|  ISO 646fr	 |  ISO 8859-1	 |
       |043	       | 243		|173		 |351		 |
       |100	       | 340		|174		 |371		 |
       |133	       | 260		|175		 |350		 |
       |134	       | 347		|176		 |250		 |
       |135	       | 247		|		 |		 |
       +---------------+----------------+----------------+---------------+

   ISO 646it (ITALIAN) to ISO 8859-1
       For the conversion of ISO 646it to ISO 8859-1, all characters not in the following table are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 646it    |  ISO 8859-1	|  ISO 646it	 |  ISO 8859-1	 |
       |043	       | 243		|140		 |371		 |
       |100	       | 247		|173		 |340		 |
       |133	       | 260		|174		 |362		 |
       |134	       | 347		|175		 |350		 |
       |135	       | 351		|176		 |354		 |
       +---------------+----------------+----------------+---------------+

   ISO 646sv (SWEDISH) to ISO 8859-1
       For the conversion of ISO 646sv to ISO 8859-1, all characters not in the following table are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 646sv    |  ISO 8859-1	|  ISO 646sv	 |  ISO 8859-1	 |
       |100	       | 311		|140		 |351		 |
       |133	       | 304		|173		 |344		 |
       |134	       | 326		|174		 |366		 |
       |135	       | 305		|175		 |345		 |
       |136	       | 334		|176		 |374		 |
       +---------------+----------------+----------------+---------------+

FILES

       /usr/lib/iconv/*.so	       conversion modules

       /usr/lib/iconv/*.t	       conversion tables

       /usr/lib/iconv/iconv_data       list of conversions supported by conversion tables

SEE ALSO

       iconv(1), iconv(3C), iconv(5)

SunOS 5.10							    28 Apr 1997 						      iconv_646(5)