get the prefered interactive shell in a given docker conatiner

doci

#!/bin/bash
SHELL_PREFERENCE=("bash zsh sh")

if [ -z "$1" ]; then
    echo "No conatiner name supplied"
    exit 255
fi

FOUND_CONTAINERS=$(docker container ls --format 'table {{.Names}}\t{{.ID}}' | grep -v "CONTAINER ID" | grep -w ${1})
EXIT_CODE=$?

if [ "${EXIT_CODE}" -ne "0" ]; then
    echo '"'${1}'" is not valid container'
    docker container ls --format 'table {{.Names}}\t{{.ID}}'
    exit 254
fi

for SHELL in ${SHELL_PREFERENCE}
do

  docker exec -it ${1} ls -1 /bin/ > .doci.tmp
  TMP=$(cat .doci.tmp | grep ${SHELL})

  EXIT_CODE=$?
  if [ "${EXIT_CODE}" -eq "0" ]; then
    rm .doci.tmp
    docker exec -it ${1} ${SHELL}
    exit $?
  fi
done

rm .doci.tmp
echo "There is no supported shell in the container"
exit 253