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Man Pages
ETDUMP(8) FreeBSD System Manager's Manual ETDUMP(8)

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:
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.
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 
done

The etdump utility first appeared in FreeBSD 11.2
April 25, 2018 FreeBSD 12.0-RELEASE

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