Maintenance Procedures                                 ISOINFO(8)


     devdump, isoinfo, isovfy, isodump  -  Utility  programs  for
     dumping and verifying iso9660 images.


     devdump isoimage

     isodump isoimage

     isoinfo [ options ] [ -find [ find expression ]]

     isovfy isoimage


     devdump is a crude utility to interactively display the con-
     tents of device or filesystem images.  The initial screen is
     a display of the first 256 bytes of the first 2048 byte sec-
     tor.  The commands are the same as with isodump.

     isodump is a crude utility to interactively display the con-
     tents  of  iso9660  images  in  order  to  verify  directory
     integrity.  The initial screen is a  display  of  the  first
     part  of  the  root  directory, and the prompt shows you the
     extent number and offset in the extent.

          You can use the 'a' and 'b' commands to move  backwards
          and  forwards  within the image. The 'g' command allows
          you to goto an arbitrary extent, and  the  'f'  command
          specifies  a  search string to be used. The '+' command
          searches forward for the next instance  of  the  search
          string, and the 'q' command exits devdump or isodump.

     isoinfo is a utility to perform directory like  listings  of
     iso9660 images.

     isovfy is a utility to verify the integrity  of  an  iso9660
     image.  Most  of  the  tests in isovfy were added after bugs
     were discovered in early versions of mkisofs. It  isn't  all
     that  clear  how useful this is anymore, but it doesn't hurt
     to have this around.


     The options common to all  programs  are  -help,-h,-version,
     i=name,dev=name.  The isoinfo program has additional command
     line options. The options are:


     -h   print a summary of all options.

     -d   Print information from the  primary  volume  descriptor

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Maintenance Procedures                                 ISOINFO(8)

          (PVD)  of  the iso9660 image. This includes information
          about Rock Ridge, Joliet extensions and  Eltorito  boot
          information if present.

     -f   generate output as if a 'find  .  -print'  command  had
          been  run  on the iso9660 image. You should not use the
          -l image with  the  -f  option.   The  same  output  is
          created by calling isoinfo with -find -print

     -find find expression
          This option acts  a  separator.  If  it  is  used,  all
          isoinfo  options  must  be  to  the  left  of the -find
          option. To the  right  of  the  -find  option,  mkisofs
          accepts the find command line syntax only.  If the find
          expression includes a -print or -ls promary, the -l  to
          isoinfo  is  ignored.  If the find expression evaluates
          as true, the selected action (e.g.  list  the  ISO-9660
          directory) is performed.

     -i iso_image
          Specifies the path of the iso9660 image that we wish to
          examine.   The  options  -i  and  dev=target are mutual

          Ignore errors.   The  commands  by  default  aborts  on
          several  errors,  such as read errors. With this option
          in effect, the commands  try  to  continue.   Use  with

          Sets the SCSI target for the drive, see notes above.  A
          typical   device  specification  is  dev=6,0  .   If  a
          filename must be provided together with  the  numerical
          target  specification,  the  filename is implementation
          specific.  The correct filename in  this  case  can  be
          found  in  the  system  specific  manuals of the target
          operating system.  On a FreeBSD system without CAM sup-
          port,   you  need  to  use  the  control  device  (e.g.
          /dev/rcd0.ctl).  A correct device specification in this
          case may be dev=/dev/rcd0.ctl:@ .

          On Linux, drives connected to a parallel  port  adapter
          are  mapped  to  a virtual SCSI bus. Different adapters
          are mapped to different targets on  this  virtual  SCSI

          If no dev option is present, the program  will  try  to
          get the device from the CDR_DEVICE environment.

          If the argument to the dev= option does not contain the
          characters  ',',  '/', '@' or ':', it is interpreted as

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Maintenance Procedures                                 ISOINFO(8)

          an  label  name  that  may  be  found   in   the   file
          /etc/default/cdrecord (see FILES section).

          The options -i and dev=target are mutual exclusive.

          Print additional debug information. This  enables  e.g.
          printing  of  all  directory entries if a file has more
          than one directory entry and printing of more  informa-
          tion from the primary volume descriptor.

          In debug mode, Rock Ridge information is parsed with -R
          even if it is not standard compliant.

     -l   generate output as if a 'ls -lR' command had  been  run
          on  the iso9660 image.  You should not use the -f image
          with the -l option.

          The numbers in square brackets are the starting  sector
          number  as decimal number (based on 2048 bytes per sec-
          tor) and the iso9660  directory  flags  as  hexadecimal
          number as follows:

          0x00 A plain file (not really a flag).

          0x01 Hide the file name from directory listings.

          0x02 A directory.

          0x04 An accociated file (e.g. an Apple resource fork).

          0x08 Record format in extended attributes is used.

          0x10 No read/execute permission in extended attributes.

          0x20 reserved

          0x40 reserved

          0x80 Not the final entry of a multi extent file.

     -N sector
          Quick hack to help examine single  session  disc  files
          that  are  to  be  written to a multi-session disc. The
          sector number specified is the sector number  at  which
          the  iso9660  image  should be written when send to the
          cd-writer. Not used for the first session on the disc.

     -p   Print path table information.

     -R   Extract information  from  Rock  Ridge  extensions  (if
          present) for permissions, file names and ownerships.

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Maintenance Procedures                                 ISOINFO(8)

     -s   Print file size infos in multiples of sector size (2048

     -J   Extract information from Joliet extensions (if present)
          for file names.

     -j charset
          Convert Joliet file names (if present) to the  supplied
          charset. See mkisofs(8) for details.

     -T sector
          Quick hack to help examine  multi-session  images  that
          have  already  been burned to a multi-session disc. The
          sector number specified is the sector  number  for  the
          start of the session we wish to display.

     -X   Extract files from the image  and  put  them  into  the
          filesystem.  If the -find option is not used, all files
          are extracted.

          The isoinfo program supports to extract all files, even
          multi extent files (files > 4 GB).

          Before extracting files using  the  -X  option,  it  is
          recommended to change the current directory to an empty
          directory in  order  to  prevent  to  clobber  existing

     -x pathname
          Extract specified file to stdout.  The  pathname  needs
          to  start  with  a  shlash ('/') and in case of iso9660
          names, must match the full pathname of the file  inlud-
          ing  the  version number (usually ';1').  If the option
          -R has been specified and the filesystem  carries  Rock
          Ridge attributes, the pathname must match the full Rock
          Ridge pathname of the file.


     The author of the original sources (1993 ... 1998)  is  Eric
     Youngdale  <>  or <>
     is to blame for these shoddy hacks.  Joerg  Schilling  wrote
     the  SCSI  transport library and its adaptation layer to the
     programs and newer parts (starting from 1999) of the  utili-
     ties,  this  makes them Copyright (C) 1999-2004 Joerg Schil-
     ling.  Patches to improve general usability would be  gladly


     The user interface really sucks.


     These utilities are  really  quick  hacks,  which  are  very

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Maintenance Procedures                                 ISOINFO(8)

     useful  for  debugging  problems in mkisofs or in an iso9660
     filesystem. In the long run, it would be nice to have a dae-
     mon that would NFS export a iso9660 image.

     The isoinfo program is probably the program that is  of  the
     most use to the general user.


     These utilities come with the cdrtools package, and the pri-
     mary              download              site              is  and   many
     other  mirror  sites.  Despite the name, the software is not


          This may either hold a device identifier that is  suit-
          able  to the open call of the SCSI transport library or
          a label in the file /etc/default/cdrecord.

     RSH  If the RSH environment is present, the  remote  connec-
          tion will not be created via rcmd(3) but by calling the
          program pointed to by RSH.  Use  e.g.  RSH=/usr/bin/ssh
          to create a secure shell connection.

          Note that this forces the program to create a  pipe  to
          the   rsh(1)  program  and  disallows  the  program  to
          directly  access  the  network  socket  to  the  remote
          server.  This makes it impossible to set up performance
          parameters and slows down the connection compared to  a
          root initiated rcmd(3) connection.

          If the RSCSI environment is present,  the  remote  SCSI
          server  will  not be the program /opt/schily/sbin/rscsi
          but the program pointed to by  RSCSI.   Note  that  the
          remote  SCSI server program name will be ignored if you
          log in using an account that has been  created  with  a
          remote SCSI server program as login shell.


          Default values can be set for the following options  in

               This may either hold a device identifier  that  is
               suitable  to  the  open call of the SCSI transport
               library    or    a    label    in     the     file
               /etc/default/cdrecord  that  allows  to identify a

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Maintenance Procedures                                 ISOINFO(8)

               specific drive on the system.

          Any other label
               is an identifier for a specific drive on the  sys-
               tem.  Such an identifier may not contain the char-
               acters ',', '/', '@' or ':'.

               Each line that follows  a  label  contains  a  TAB
               separated  list  of  items.  Currently, four items
               are recognized: the SCSI  ID  of  the  drive,  the
               default  speed that should be used for this drive,
               the default FIFO size that should be used for this
               drive  and  drive specific options. The values for
               speed and fifosize may be set to -1  to  tell  the
               program to use the global defaults.  The value for
               driveropts may be set to "" if no  driveropts  are
               used.  A typical line may look this way:

               teac1= 0,5,0   4    8m   ""

               yamaha= 1,6,0  -1   -1   burnfree

               This tells the program that a drive named teac1 is
               at  scsibus  0, target 5, lun 0 and should be used
               with speed 4 and a FIFO size of 8  MB.   A  second
               drive  may  be found at scsibus 1, target 6, lun 0
               and uses the default speed and  the  default  FIFO


     mkisofs(8), cdrecord(1), readcd(1), scg(7), rcmd(3), ssh(1).

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