Get the last Docker image built

Question

This command gives a list of image and container IDs ordered from top to bottom by last build time:

docker images

All my docker images are appended with the hash git head commit.

The results

REPOSITORY                                 TAG                 IMAGE ID            CREATED             SIZE
username/play-table-of-contents-1474f94    latest              6141b8177c2f        34 minutes ago      149MB
username/play-table-of-contents-2616f5f    latest              2b5422dd91ba        About an hour ago   149MB

Is there a way to get only the last image by name ? ( ie: case 6141b8177c2f )

I tried with

docker images --format "{{.Names}}"

My end goal is to run the last docker image built. To do this, I need to

1. get the last image name in bash script variable.
2. docker run ... $last_image ...

Answer 1

All the other answers' solution relies on the fact docker image sorts the output by date already. This may not be true. A consistent solution would be to sort them by the creation date and get the latest one. I used the following command, this is consistent.

docker images --format "{{.ID}} {{.CreatedAt}}" | sort -rk 2 | awk 'NR==1{print $1}'

This command sorts the output of the docker images command by CreatedAt column and print the id of the latest image