change_bash_version(){

  if test "$1" == "3"; then

    export PATH="$HOME/bash/versions/3.2.57:${PATH}"

  elif test "$1" == "4"; then

    export PATH="$HOME/bash/versions/4.4.18:${PATH}"

  else

    export PATH="$HOME/bash/versions/5.0:${PATH}"

  fi

}

export -f change_bash_version