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docker exec

Execute a command on an already running Docker container.

More information.

Enter an interactive shell session on an already-running container:

docker exec --interactive --tty {container_name} {/bin/bash}

Run a command in the background (detached) on a running container:

docker exec --detach {container_name} {command}

Select the working directory for a given command to execute into:

docker exec --interactive -tty --workdir {path/to/directory} {container_name} {command}

Run a command in background on existing container but keep stdin open:

docker exec --interactive --detach {container_name} {command}

Set an environment variable in a running Bash session:

docker exec --interactive --tty --env {variable_name}={value} {container_name} {/bin/bash}

Run a command as a specific user:

docker exec --user {user} {container_name} {command}

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