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tldr/pages/common/docker-exec.md
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# docker exec
> Execute a command on an already running Docker container.
> More information: <https://docs.docker.com/reference/cli/docker/container/exec/>.
- Enter an interactive shell session on an already-running container:
`docker exec {{[-it|--interactive --tty]}} {{container_name}} {{/bin/bash}}`
- Run a command in the background (detached) on a running container:
`docker exec {{[-d|--detach]}} {{container_name}} {{command}}`
- Select the working directory for a given command to execute into:
`docker exec {{[-it|--interactive --tty]}} {{[-w|--workdir]}} {{path/to/directory}} {{container_name}} {{command}}`
- Run a command in background on existing container but keep `stdin` open:
`docker exec {{[-i|--interactive]}} {{[-d|--detach]}} {{container_name}} {{command}}`
- Set an environment variable in a running Bash session:
`docker exec {{[-it|--interactive --tty]}} {{[-e|--env]}} {{variable_name}}={{value}} {{container_name}} {{/bin/bash}}`
- Run a command as a specific user:
`docker exec {{[-u|--user]}} {{user}} {{container_name}} {{command}}`