isosize
displays the size of ISO 9660 filesystem images by reading the volume descriptor
TLDR
Display the size of an ISO file
$ isosize [path/to/file.iso]
Display block count and block size$ isosize -x [path/to/file.iso]
Display size divided by a specific number$ isosize -d [number] [path/to/file.iso]
SYNOPSIS
isosize [options] file
DESCRIPTION
isosize displays the size of ISO 9660 filesystem images by reading the volume descriptor. Unlike tools that report file size, isosize reports the actual filesystem size stored in the ISO header.
This can be useful when the ISO image file has been padded or when determining the exact size needed to write the image to media.
PARAMETERS
-x, --sectors
Show block count and block size instead of total bytes-d, --divisor NUM
Divide size by specified number (incompatible with -x)
CAVEATS
Only works with valid ISO 9660 images. Reports the size recorded in the volume descriptor, which may differ from file size if the image was truncated or padded.
HISTORY
isosize is part of the util-linux package, providing a simple utility for querying ISO image sizes. It reads the ISO 9660 Primary Volume Descriptor to determine size.
SEE ALSO
isoinfo(1), genisoimage(1), du(1)