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Add more info on attach inspired by discussion in #2855

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

Sven Dowideit authored on 2014/10/07 12:56:55
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@@ -146,11 +146,14 @@ Docker supports softlinks for the Docker data directory
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       --no-stdin=false    Do not attach STDIN
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       --sig-proxy=true    Proxy all received signals to the process (even in non-TTY mode). SIGCHLD, SIGKILL, and SIGSTOP are not proxied.
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-The `attach` command will allow you to view or
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-interact with any running container, detached (`-d`)
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-or interactive (`-i`). You can attach to the same
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-container at the same time - screen sharing style, or quickly view the
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-progress of your daemonized process.
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+The `attach` command lets you view or interact with any running container's
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+primary process (`pid 1`).
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+
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+You can attach to the same contained process multiple times simultaneously, screen
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+sharing style, or quickly view the progress of your daemonized process.
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+
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+> **Note:** This command is not for running a new process in a container.
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+> See: [`docker exec`](#exec).
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 You can detach from the container again (and leave it running) with
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 `CTRL-p CTRL-q` (for a quiet exit), or `CTRL-c`  which will send a