How to show the ID of the oldest running docker container?

I using docker Docker version 1.3.2, build 50b8feb. There are some new filters for the ps command, but it seems nothing provide what I need. I just want to see the oldest container running, to kill it, wait and kill the next oldest one. I hope somebody can come around with some bash magic I am not able to see at the moment. Thanks!

UPDATE:

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  • One Solution collect form web for “How to show the ID of the oldest running docker container?”

    Oh yeah, captain obvious. I just needed to use tail.

    docker ps -aq | tail -n 1
    
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