FreeBSD manual

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ETDUMP(8) FreeBSD System Manager's Manual ETDUMP(8) 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 HISTORY The etdump utility first appeared in FreeBSD 11.2 FreeBSD 14.0-RELEASE-p11 April 25, 2018 FreeBSD 14.0-RELEASE-p11