ETDUMP(1) User Commands ETDUMP(1)

NAME

etdump - Dump El Torito boot catalog information from ISO images

SYNOPSIS

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

DESCRIPTION

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
image.

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

EXAMPLES

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
done

illumos April 3, 2018 illumos