小弟第一次写个Linux的Shell，目的也就是让程序判断443端口，8080端口是否正常，不正常的话启动相应的服务

内容如下：
#!/bin/bash
#program:
#This progrem auto check-up netsafe_log process and delete this process.

testing443=`(netstat -an | grep 443 )`
while [ "$testing443" = "" ]
do
/home/admin/Onion/Start443.sh
done

testing9002=`(netstat -an | grep 9002)`
while [ "$testing9002" = "" ]
do
/home/admin/Onion/Start9002.sh
done

但是总是报错：
: command not founde 4:
: command not founde 5:
: command not founde 6:
netsafe_log.sh: line 18: syntax error: unexpected end of file

请问这个是怎么回事？

相关了解……