# Docker Commands to Remember

*This article is a list of some Docker commands you should keep in mind.*

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  1. docker exec <br>
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## `docker exec`

- **Description**: execute a command in a running container
- **Usage**: `docker exec [OPTIONS] CONTAINER COMMAND [ARG...]`

### Description

The `docker exec` command runs a new command in a **running** container.

### Options

- `-d`, `--detach`: detached mode (run command in the background)
- `-i`, `--interactive`: keep STDIN open even if not attached
- `-t`, `--tty`: allocate a pseudo-TTY
- `-u`, `--user`: username or UID

### Examples

- **Execute an interactive `sh` shell inside *mycontainer*** : `docker exec -it mycontainer sh`
- **Execute an interactive `sh` shell inside *mycontainer* with the *root* user**: `docker exec -it --user root mycontainer sh`