docker-exec

Execute a command on an already running Docker container.

TLDR

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

$ docker exec --interactive --detach [container_name] [command]
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Set an environment variable in a running bash session

$ docker exec --interactive --tty --env [variable_name]=[value] [container_name] [/bin/bash]
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Run a command as a specific user

$ docker exec --user [user] [container_name] [command]
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