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Docker wait command

In this tutorial, you'll learn how to use the docker wait command, which blocks the terminal until one or more containers stop, then prints their exit codes.

Prerequisites:
- Install Docker on your system
Run a container:
First, you'll need a running container to work with. If you don't already have one, create a new container using the official ubuntu image:
```
docker run --name ubuntu-container -d ubuntu sleep 10
```
This command creates a new container named ubuntu-container, runs it in detached mode (-d flag), and uses the sleep 10 command to keep the container running for 10 seconds.
Wait for the container to stop:
To wait for a running container to stop, use the docker wait command followed by the container ID or name:
```
docker wait ubuntu-container
```
This command will block the terminal until the ubuntu-container stops. When the container stops (in this case, after 10 seconds), the command will print the exit code of the container's main process (usually 0 if the process terminated successfully).
Use the exit code:
You can use the exit code returned by the docker wait command in your scripts or as part of your workflow. For example, you could use the exit code to trigger other actions, such as restarting a container or notifying an administrator.

In this tutorial, we covered how to use the docker wait command to block the terminal until one or more containers stop and print their exit codes. This command is useful for synchronizing tasks or scripts with the lifecycle of your Docker containers, as well as for monitoring containers and handling their termination.

Docker Wait Command Usage:
- Description: The docker wait command is used to block until a container stops, then prints the container's exit code.
- Code Example:
```
docker wait container_id
```
How to Use Docker Wait in Containers:
- Description: Use docker wait within a script or to synchronize tasks dependent on the completion of a container.
- Code Example:
```
docker run -d --name my_container my_image
docker wait my_container
```
Wait for Container to Finish in Docker:
- Description: Pause execution until a specified container stops.
- Code Example:
```
docker wait my_container
```
Docker Wait Command Example:
- Description: An example illustrating how to use docker wait to wait for a container to finish.
- Code Example:
```
docker run -d --name my_container my_image
docker wait my_container
```
Delay Execution in Docker Container with Wait:
- Description: Create delays in the execution of subsequent commands by using docker wait.
- Code Example:
```
docker run -d --name my_container my_image
docker wait my_container && echo "Container has finished."
```
Docker Wait vs Sleep Command:
- Description: While docker wait waits for a container to exit, sleep introduces a delay for a specified duration.
- Code Example (Using Sleep):
```
docker run -d --name my_container my_image
sleep 5
```
Docker Wait for Specific Process to Complete:
- Description: Use docker wait to wait for a specific process within a container to complete.
- Code Example:
```
docker run -d --name my_container my_image
docker wait my_container
```

Docker Container Synchronization with Wait Command:

Description: Achieve synchronization between containers or tasks using docker wait.

Code Example:

# Start multiple containers
docker run -d --name container1 my_image
docker run -d --name container2 my_image

# Wait for containers to finish
docker wait container1 container2