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Add a link to some documentation about exec.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)

Sven Dowideit authored on 2014/10/24 11:41:19
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@@ -313,8 +313,9 @@ beginning user will then be forced to learn about `ENTRYPOINT` and
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 `--entrypoint`.
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 In order to avoid a situation where commands are run without clear visibility
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-to the user, make sure your script ends with something like `exec "$@"`. After
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-the entrypoint completes, the script will transparently bootstrap the command
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+to the user, make sure your script ends with something like `exec "$@"` (see
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+[the exec builtin command](http://wiki.bash-hackers.org/commands/builtin/exec)).
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+After the entrypoint completes, the script will transparently bootstrap the command
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 invoked by the user, making what has been run clear to the user (for example,
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 `docker run -it mysql mysqld --some --flags` will transparently run
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 `mysqld --some --flags` after `ENTRYPOINT` runs `initdb`).