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@@ -1142,10 +1142,11 @@ volume mounted on the host).
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### USER
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-The default user within a container is `root` (id = 0), but if the
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-developer created additional users, those are accessible too. The
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-developer can set a default user to run the first process with the
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-Dockerfile `USER` instruction, but the operator can override it:
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+The default user within a container is `root` (id = 0), but if the developer
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+created additional users, those are accessible by name. When passing a numeric
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+ID, the user doesn't have to exist in the container. The developer can set a
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+default user to run the first process with the Dockerfile `USER` instruction,
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+but the operator can override it:
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-u="": Username or UID
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