ETDUMP(1) User Commands ETDUMP(1)


etdump - Dump El Torito boot catalog information from ISO images


etdump [-f format] [-o file] file ...


This program reads El Torito boot catalog information from an ISO image and
outputs it in various formats. It can be used to check the catalog in an
image or to output catalog data in a format that can be used by other tools
such as shell scripts.

Supported options are:

-f format --format format
Select the output format. Supported output formats are:

text Human-readable text (default)

shell Each boot entry is emitted as a string suitable for
passing to a sh-compatible eval command. The variables
emitted are:

et_platform The platform ID from the section
header. Set to 'default' for the
initial (default) entry.

et_system The system ID from the boot entry.

et_lba The starting LBA (2048-byte blocks)
of the boot image.

et_sectors The number of sectors (512-byte
sectors) that comprise the boot

-o file --output file
Write output to file. If '-' is specified then standard out is used.


To see what entries are in a given boot catalog run etdump passing the
filename of the image as an argument like so:

% etdump bootonly.iso
Image in bootonly.iso
Default entry
System i386
Start LBA 420 (0x1a4), sector count 4 (0x4)
Media type: no emulation

Section header: efi, final
Section entry
System i386
Start LBA 20 (0x14), sector count 1600 (0x640)
Media type: no emulation

To use the output in a shell script a for loop can be used to iterate over
the entries returned using eval:

for entry in `etdump --format shell bootonly.iso`; do
eval $entry
echo $et_platform $et_system $et_lba $et_sectors

OmniOS April 3, 2018 OmniOS