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docs: contrast image ls and image prune filter keys #7164

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6 changes: 6 additions & 0 deletions docs/reference/commandline/image_ls.md
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Expand Up @@ -150,6 +150,12 @@ The currently supported filters are:
* since (`<image-name>[:<tag>]`, `<image id>` or `<image@digest>`) - filter images created since given id or references
* reference (pattern of an image reference) - filter images whose reference matches the specified pattern

These keys are **not** the same set as `docker image prune --filter`. Prune
supports `until` and `label` / `label!=...`, but not `dangling`, `before`,
`since`, or `reference`. Negative label filters (`label!=...`) work with prune
but not with `docker image ls`, so you cannot always preview prune matches with
`image ls`. See [docker image prune](image_prune.md#filter).

#### Show untagged images (dangling)

```console
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4 changes: 4 additions & 0 deletions docs/reference/commandline/image_prune.md
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Expand Up @@ -77,6 +77,10 @@ The currently supported filters are:
* until (`<timestamp>`) - only remove images created before given timestamp
* label (`label=<key>`, `label=<key>=<value>`, `label!=<key>`, or `label!=<key>=<value>`) - only remove images with (or without, in case `label!=...` is used) the specified labels.

`docker image ls --filter` uses a different key set (`dangling`, `label`,
`before`, `since`, `reference`) and does not accept `until` or `label!=...`.
Do not assume the two commands share filter syntax.

The `until` filter can be Unix timestamps, date formatted
timestamps, or Go duration strings supported by [ParseDuration](https://pkg.go.dev/time#ParseDuration) (e.g. `10m`, `1h30m`) computed
relative to the daemon machine’s time. Supported formats for date
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