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<!--[metadata]>
+++
title = "exec"
description = "The exec command description and usage"
keywords = ["command, container, run, execute"]
[menu.main]
parent = "smn_cli"
+++
<![end-metadata]-->
# exec
Usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
Run a command in a running container
-d, --detach Detached mode: run command in the background
--detach-keys Specify the escape key sequence used to detach a container
--help Print usage
-i, --interactive Keep STDIN open even if not attached
--privileged Give extended Linux capabilities to the command
-t, --tty Allocate a pseudo-TTY
-u, --user= Username or UID (format: <name|uid>[:<group|gid>])
The `docker exec` command runs a new command in a running container.
The command started using `docker exec` only runs while the container's primary
process (`PID 1`) is running, and it is not restarted if the container is
restarted.
If the container is paused, then the `docker exec` command will fail with an error:
$ docker pause test
test
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1ae3b36715d2 ubuntu:latest "bash" 17 seconds ago Up 16 seconds (Paused) test
$ docker exec test ls
FATA[0000] Error response from daemon: Container test is paused, unpause the container before exec
$ echo $?
1
## Examples
$ docker run --name ubuntu_bash --rm -i -t ubuntu bash
This will create a container named `ubuntu_bash` and start a Bash session.
$ docker exec -d ubuntu_bash touch /tmp/execWorks
This will create a new file `/tmp/execWorks` inside the running container
`ubuntu_bash`, in the background.
$ docker exec -it ubuntu_bash bash
This will create a new Bash session in the container `ubuntu_bash`.
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