清理docker

删掉不在运行的docker：
#!/bin/sh
if [ -f /tmp/docker.txt ]
   then
      rm -f /tmp/docker.txt
fi
docker ps -a |egrep -v Up|awk -F '[ ]+' '{print $1}'|sed 1d >/tmp/docker.txt
while read line
do
   docker rm $line
done </tmp/docker.txt