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# Docker exec Command [Docker Command Manual](#) * * * The `docker exec` command is used to execute a new command inside a running container. This is very useful for debugging, running additional processes, or performing management operations within the container. ### Syntax docker exec CONTAINER COMMAND [ARG...] ### Common Parameters * **`-d, --detach`**: Run command in the background. * **`--detach-keys`**: Override the key sequence for detaching a container. * **`-e, --env`**: Set environment variables. * **`--env-file`**: Read in a file of environment variables. * **`-i, --interactive`**: Keep STDIN open. * **`--privileged`**: Give extended privileges to this command. * **`--user, -u`**: Run the command as the specified user. * **`--workdir, -w`**: Working directory inside the container. ### Examples Run a command inside the container: docker exec my_container ls /app Execute the `ls /app` command inside the running `my_container` container, listing the contents of the `/app` directory. Run a command in interactive mode: docker exec -it my_container /bin/bash Start an interactive Bash shell inside the running `my_container` container. `-i` keeps STDIN open, and `-t` allocates a pseudo-TTY. Run a command in the background: docker exec -d my_container touch /app/newfile.txt Execute the `touch /app/newfile.txt` command in the background inside the running `my_container` container, creating a new file. Set environment variables: docker exec -e MY_ENV_VAR=my_value my_container env Execute the `env` command inside the running `my_container` container, setting the environment variable `MY_ENV_VAR` to the value `my_value`. Run a command as a specified user: docker exec -u user123 my_container whoami Execute the `whoami` command inside the running `my_container` container as the user `user123`. Specify the working directory: docker exec -w /app my_container pwd Execute the `pwd` command inside the running `my_container` container with `/app` as the working directory. ### Use Cases * **Debugging Containers**: Enter the container to debug and troubleshoot issues. * **Management Tasks**: Run additional administrative tasks or maintenance operations inside the container. * **Monitoring and Inspection**: Execute monitoring and inspection commands inside the container to get runtime status and logs. ### Summary The `docker exec` command is a very powerful tool in Docker, allowing users to execute additional commands inside a running container. It is extremely useful for debugging, managing, and maintaining containers, helping users to more flexibly control and operate the internal environment of a container. * * Docker Command Manual](#)