devdump, isoinfo, isovfy, isodump - Utility programs for dumping and
verifying iso9660 images.
isoinfo [ -d ] [ -h ] [ -R ] [ -J ] [ -j charset ] [ -f ] [ -l ] [ -p ]
[ -T sector ] [ -N sector ] [ -i isoimage ] [ -x path ]
DESCRIPTIONdevdump is a crude utility to interactively display the contents of
device or filesystem images. The initial screen is a display of the
first 256 bytes of the first 2048 byte sector. The commands are the
same as with isodump.
isodump is a crude utility to interactively display the contents 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 for‐
wards 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
isoinfo is a utility to perform directory like listings of iso9660
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 any‐
more, 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 (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
Specifies the path of the iso9660 image that we wish to examine.
The options -i and dev=target are mutual exclusive.
Sets the SCSI target for the drive, see notes above. A typical
device specification is dev=6,0 . If a filename must be pro‐
vided 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
On Linux, drives connected to a parallel port adapter are mapped
to a virtual SCSI bus. Different adapters are mapped to differ‐
ent targets on this virtual SCSI bus.
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 charac‐
ters ',', '/', '@' or ':', it is interpreted as an label name
that may be found in the file /etc/default/cdrecord (see FILES
The options -i and dev=target are mutual exclusive.
-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
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 writ‐
ten 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.
-J Extract information from Joliet extensions (if present) for file
Convert Joliet file names (if present) to the supplied charset.
See mkisofs(8) for details.
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.
Extract specified file to stdout.
The author of the original sources (1993 ... 1998) is Eric Youngdale
<email@example.com> or <firstname.lastname@example.org> 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 utilities, this makes them Copyright (C) 1999-2004 Joerg
Schilling. Patches to improve general usability would be gladly
The user interface really sucks.
These utilities are really quick hacks, which are very useful for
debugging problems in mkisofs or in an iso9660 filesystem. In the long
run, it would be nice to have a daemon that would NFS export a iso9660
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 primary ftp
site is ftp.berlios.de in /pub/cdrecord and many other mirror sites.
Despite the name, the software is not beta.
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
RSH If the RSH environment is present, the remote connection 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
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.
RSCSI 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 specific drive on the system.
Any other label
is an identifier for a specific drive on the system.
Such an identifier may not contain the characters ',',
'/', '@' 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 val‐
ues 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 size.
SEE ALSOmkisofs(8), cdrecord(1), readcd(1), scg(7), rcmd(3), ssh(1).
Version 2.0 07/06/29 ISOINFO(8)