查看system中服务是否开启，自己第一个shell

# !/bin/bash

# program:

# Using netstat and grep to detect WWW,SSH,FTP and MAIL services.

# History:

# 2011/07/24     canfg release

 PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin

 export PATH

        echo "Now,I will detect your Linux server's services!"

        echo -e "The www,ftp,ssh,and mail will be detect! \n"

            testing=$(netstat -tuln | grep ":80")

        if [ "testint" != "" ];then

            echo "WWW is runing in your system."

        fi

            testing=$(netstat -tuln | grep ":22")

        if [ "testing" != "" ];then

            echo "SSH is runing your system."

        fi

            testing=$(netstat -tuln | grep ":21")

        if [ "testing" != "" ];then

            echo "FTP is runing your system."

        fi

            testing=$(netstat -tuln | grep ":25")

        if [ "testing" != "" ];then

            echo "MAIL is runing your system."

        fi