我正在用脚本开始一个pyspark jupyter笔记本：

!/bin/bash
ipaddres=...
echo "Start notebook server at IP address $ipaddress"

function snotebook ()
{
Spark path (based on your computer)
SPARK_PATH=/home/.../software/spark-2.3.1-bin-hadoop2.7

export PYSPARK_DRIVER_PYTHON="jupyter"
export PYSPARK_DRIVER_PYTHON_OPTS="notebook"

For python 3 users, you have to add the line below or you will get an error
export PYSPARK_PYTHON=python3

$SPARK_PATH/bin/pyspark --master local[10]
}

snotebook --no-browser --ip $ipaddress --certfile=/home/.../local/mycert.pem --keyfile /home/.../local/mykey.key
我想知道如何设置端口。我可以设置一个环境变量吗？我想在笔记本电脑启动之前确定端口。我试过了--port 7999。