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give `docker save` a gzip usage guide (#1678) 

give `docker save` a gzip usage guide

Signed-off-by: Ao Li <la9249@163.com>
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leonGravel 2019-03-22 05:49:21 +08:00 committed by Tõnis Tiigi
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commit 95ce54a8de
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docs/reference/commandline/save.md
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@ -53,6 +53,14 @@ $ docker save -o fedora-all.tar fedora
$ docker save -o fedora-latest.tar fedora:latest
```
### Save an image to a tar.gz file using gzip
You can use gzip to save the image file and make the backup smaller.
```bash
docker save myimage:latest | gzip > myimage_latest.tar.gz
```
### Cherry-pick particular tags
You can even cherry-pick particular tags of an image repository.