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standardize documentation formatting
Signed-off-by: Ashley Cui <ashleycui16@gmail.com>
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% PODMAN(1) Podman Man Pages
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% Brent Baude
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% December 2018
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# NAME
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% podman-image-prune(1)
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## NAME
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podman-image-prune - Remove all unused images
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# SYNOPSIS
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**podman image prune** [*-a*|*--all*] [*-h*|*--help*]
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## SYNOPSIS
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**podman image prune** [*options*]
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# DESCRIPTION
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## DESCRIPTION
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**podman image prune** removes all dangling images from local storage. With the `all` option,
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you can delete all unused images. Unused images are dangling images as well as any image that
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does not have any containers based on it.
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## OPTIONS
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**--all, -a**
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**--all**, **-a**
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Remove dangling images and images that have no associated containers.
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**--help**, **-h**
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Print usage statement
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## Examples ##
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Remove all dangling images from local storage
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## SEE ALSO
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podman(1), podman-images
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# HISTORY
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## HISTORY
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December 2018, Originally compiled by Brent Baude (bbaude at redhat dot com)
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