document DOCKER_HIDE_LEGACY_COMMANDS env-var
The `DOCKER_HIDE_LEGACY_COMMANDS` environment
variable was added in a7c8bcac2b
but not documented.
This adds the variable to the documentation.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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@ -69,6 +69,9 @@ by the `docker` command line:
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Equates to `--disable-content-trust=false` for build, create, pull, push, run.
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* `DOCKER_CONTENT_TRUST_SERVER` The URL of the Notary server to use. This defaults
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to the same URL as the registry.
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* `DOCKER_HIDE_LEGACY_COMMANDS` When set, Docker hides "legacy" top-level commands (such as `docker rm`, and
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`docker pull`) in `docker help` output, and only `Management commands` per object-type (e.g., `docker container`) are
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printed. This may become the default in a future release, at which point this environment-variable is removed.
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* `DOCKER_TMPDIR` Location for temporary Docker files.
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Because Docker is developed using Go, you can also use any environment
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