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.Dd April 25, 2018 .Dt ETDUMP 8 .Os .Sh NAME .Nm etdump .Nd Dump El Torito boot catalog information from ISO images .Sh SYNOPSIS .Nm .Op Fl f Ar format .Op Fl o Ar file .Ar .Sh 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.
p Supported options are: l -tag -width flag t Fl f Ar format Fl -format Ar format Select the output format. Supported output formats are: l -tag -width shell -offset indent t Sy text Human-readable text (default) t Sy shell Each boot entry is emitted as a string suitable for passing to a sh-compatible eval command. The variables emitted are: l -tag -width et_platform -offset indent t et_platform The platform ID from the section header. Set to 'default' for the initial (default) entry. t et_system The system ID from the boot entry. t et_lba The starting LBA (2048-byte blocks) of the boot image. t et_sectors The number of sectors (512-byte sectors) that comprise the boot image. .El .El t Fl o Ar file Fl -output Ar file Write output to .Ar file . If '-' is specified then standard out is used. .El .Sh EXAMPLES To see what entries are in a given boot catalog run .Nm passing the filename of the image as an argument like so: d -literal -offset indent % 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 .Ed
p To use the output in a shell script a for loop can be used to iterate over the entries returned using eval: d -literal -offset indent for entry in `etdump --format shell bootonly.iso`; do eval $entry echo $et_platform $et_system $et_lba $et_sectors done .Ed .Sh HISTORY The .Nm utility first appeared in .Fx 11.2