Improve usage details on overriding USER command in Docker run reference page
Signed-off-by: Sian Lerk Lau <kiawin@gmail.com>
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@ -1429,7 +1429,10 @@ The developer can set a default user to run the first process with the
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Dockerfile `USER` instruction. When starting a container, the operator can override
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the `USER` instruction by passing the `-u` option.
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-u="": Username or UID
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-u="", --user="": Sets the username or UID used and optionally the groupname or GID for the specified command.
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The followings examples are all valid:
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--user=[ user | user:group | uid | uid:gid | user:gid | uid:group ]
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> **Note:** if you pass a numeric uid, it must be in the range of 0-2147483647.
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