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/engine/reference/commandline/exec/>.
- Enter an interactive shell session on an already-running container:
`docker exec --interactive --tty {{container_name}} {{/bin/bash}}`
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- Run a command in the background (detached) on a running container:
`docker exec --detach {{container_name}} {{command}}`
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- Select the working directory for a given command to execute into:
`docker exec --interactive -tty --workdir {{path/to/directory}} {{container_name}} {{command}}`
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- Run a command in background on existing container but keep stdin open:
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`docker exec --interactive --detach {{container_name}} {{command}}`
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- Set an environment variable in a running Bash session:
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`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}}`