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Explain what the VIRTUAL SIZE means

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Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
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Sven Dowideit 2014-11-21 13:47:03 -08:00 committed by Tibor Vass
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docs/sources/reference/commandline/cli.md
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@ -796,6 +796,10 @@ decrease disk usage, and speed up `docker build` by
allowing each step to be cached. These intermediate layers are not shown
by default.
The `VIRTUAL SIZE` is the cumulative space taken up by the image and all
its parent images. This is also the disk space used by the contents of the
Tar file created when you `docker save` an image.
An image will be listed more than once if it has multiple repository names
or tags. This single image (identifiable by its matching `IMAGE ID`)
uses up the `VIRTUAL SIZE` listed only once.