ISOSIZE(8)		     System Administration		    ISOSIZE(8)

NAME
       isosize - output the length of an iso9660 filesystem

SYNOPSIS
       isosize [options] iso9660_image_file

DESCRIPTION
       This command outputs the length of an iso9660 filesystem that is
       contained in the specified file. This file may be a normal file or a
       block device (e.g. /dev/hdd or /dev/sr0). In the absence of any options
       (and errors), it will output the size of the iso9660 filesystem in
       bytes. This can now be a large number (>> 4 GB).

OPTIONS
       -x, --sectors
	   Show the block count and block size in human-readable form. The
	   output uses the term "sectors" for "blocks".

       -d, --divisor number
	   Only has an effect when -x is not given. The value shown (if no
	   errors) is the iso9660 file size in bytes divided by number. So if
	   number is the block size then the shown value will be the block
	   count.

	   The size of the file (or block device) holding an iso9660
	   filesystem can be marginally larger than the actual size of the
	   iso9660 filesystem. One reason for this is that cd writers are
	   allowed to add "run out" sectors at the end of an iso9660 image.

       -h, --help
	   Display help text and exit.

       -V, --version
	   Display version and exit.

EXIT STATUS
       0
	   success

       1
	   generic failure, such as invalid usage

       32
	   all failed

       64
	   some failed

REPORTING BUGS
       For bug reports, use the issue tracker
       <https://github.com/util-linux/util-linux/issues>.

AVAILABILITY
       The isosize command is part of the util-linux package which can be
       downloaded from Linux Kernel Archive
       <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.41.2		  2025-09-22			    ISOSIZE(8)