ethereum docker geth shell for geth attach and tail log

Help use docker geth for geth attach and watch log. Geth Command line path need to change for yourself env.

#!/bin/sh
IFS=$'\n'
echo $1
echo $2

case $2 in
    attach) docker exec -it $(docker ps -a --no-trunc  | grep $1 | awk '{print $1}') geth attach --datadir=/root/.ethereum/devchain
        ;;
    log) docker exec -it $(docker ps -a --no-trunc  | grep $1 | awk '{print $1}') tail -n 30 -f /root/geth.log
        ;;
    sh) docker exec -it $(docker ps -a --no-trunc  | grep $1 | awk '{print $1}') sh
        ;;
    bash) docker exec -it $(docker ps -a --no-trunc  | grep $1 | awk '{print $1}') bash
        ;;
    *)  echo "command parms1: docker container name"
        echo "command parms2: attach (geth attach) or log (tail -n 30 -f) or sh or bash"
esac