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Clarify --env-file usage with names without values
Signed-off-by: Denis Defreyne <denis@soundcloud.com>
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@ -393,17 +393,20 @@ If no `=` is provided and that variable is not exported in your local
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environment, the variable won't be set in the container.
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You can also load the environment variables from a file. This file should use
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the syntax `<variable>= value`, and `#` for comments.
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the syntax `<variable>=value` (which sets the variable to the given value) or
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`<variable>` (which takes the value from the local environment), and `#` for comments.
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```bash
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$ cat env.list
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# This is a comment
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VAR1=value1
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VAR2=value2
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USER
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$ docker run --env-file env.list ubuntu env | grep VAR
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VAR1=value1
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VAR2=value2
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USER=denis
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```
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### Set metadata on container (-l, --label, --label-file)
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