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docs: provide documentation for docker remove untagged utility

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Documenting what the `docker_remove_untagged_img.sh` script does.
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Manuel Castellin 2020-02-28 18:46:00 +00:00
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@ -21,3 +21,11 @@ The script allows me to easily see if there are some data volumes on my disk tha
up a lot of space and are not needed anymore.
You can find more details in my blog post [Listing information for all your named/unnamed data volumes](https://www.guidodiepen.nl/2017/04/listing-information-for-all-your-named-unnamed-data-volumes/)
## docker_remove_untagged_img.sh
The purpose for this script is to remove all untagged images from the docker local registry.
When building the same docker images multiple times, it is easy to leave a lot of them behind
without tags, especially when using `<latest>` tags. These eat up precious space in the
hard drive and have little benefit. The convenience script run the `docker rmi` command for all
images with no tags assigned.