isosize(8) — Linux manual page

NAME \| SYNOPSIS \| DESCRIPTION \| OPTIONS \| EXIT STATUS \| REPORTING BUGS \| AVAILABILITY

ISOSIZE(8)                System Administration                ISOSIZE(8)

NAME top

       isosize - output the length of an iso9660 filesystem

SYNOPSIS top

       isosize [options] iso9660_image_file

DESCRIPTION top

       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 top

       -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 top

       0
           success

       1
           generic failure, such as invalid usage

       32
           all failed

       64
           some failed

REPORTING BUGS top

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

AVAILABILITY top

       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/>. This page is
       part of the util-linux (a random collection of Linux utilities)
       project. Information about the project can be found at 
       ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
       bug report for this manual page, send it to
       util-linux@vger.kernel.org. This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2025-08-11. (At that time, the date of the most recent commit that
       was found in the repository was 2025-08-05.) If you discover any
       rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page,
       or you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a
       mail to man-pages@man7.org

util-linux 2.42-start-521-ec46  2025-01-16                     ISOSIZE(8)