dsmf

docker logs nginx 2>&1 | grep "127." 

# ref: http://stackoverflow.com/questions/34724980/finding-a-string-in-docker-logs-of-container

dsmf

### grep docker logs:
  docker logs CONTAINER 2>&1 | grep "something" 

### online liner commit running container, then squashed image:
  docker save $(docker commit supatest supatest) | docker-squash -t supatest -verbose | docker load


### one liner to stop / remove all of Docker containers:
  docker stop $(docker ps -a -q)
  docker rm $(docker ps -a -q)