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

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i using docker docker version 1.3.2, build 50b8feb. there new filters ps command, seems nothing provide need. want see oldest container running, kill it, wait , kill next oldest one. hope can come around bash magic not able see @ moment. thanks!

update:

sort not want since resorts before reverting order.

oh yeah, captain obvious. needed use tail. 

docker ps -aq | tail -n 1

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