Often we need to run shell commands on a running docker container. The traditional way would be to run docker exec -it <container> /bin/bash for example. Below is an alias to simplify this process a bit.

# Run a shell in the specified container.
dkexsh() {
  if [ $# -ne 1 ]; then
    echo "Usage: $funcstack[1] CONTAINER_ID"
    return 1
  fi

  if docker exec -it $1 /bin/bash; then :; else
    echo "/bin/bash not available in container. Trying /bin/sh"
    docker exec -it $1 /bin/sh
  fi
}
alias dksh='dkexsh'

Now we can run dksh <container> and will be dropped into a shell on that container. You can modify it to fruther add different shells, but the alias will first try to execute /bin/bash and if that fails /bin/sh.