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ETDUMP(1) FreeBSD General Commands Manual ETDUMP(1) NAME etdump - dump ISO-9660 El Torito boot catalog information SYNOPSIS etdump [-f format] [-o file] file ... DESCRIPTION This program reads El Torito boot catalog information from an ISO-9660 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 SEE ALSO cd9660(4) HISTORY The etdump utility first appeared in FreeBSD 11.2 FreeBSD 14.1-RELEASE-p8 January 18, 2025 FreeBSD 14.1-RELEASE-p8