#!/bin/bash

　　#program:Usingtostudythe[if...then...fi]program

　　#dsk2007/10/83:00

　　#content:Iwillusingthisprogramtoshowyousevices

　　#1.printtheprogram''sworkinyourscreen

　　echo “Now,the service of your Linux system will be detect!“

　　echo “The www,ftp,ssh,and sendmail pop3 will be detect!“

　　echo ““

　　#2.www

　　www=`netstat -ntlp | awk '{print $4}' | grep :80$`

　　if [ “$www“ != ““ ];

　　then

　　echo $www

　　echo “WWW is runing“

　　else

　　echo $www

　　echo “WWW is NOT runing“

　　killall -9 httpd

　　/usr/sbin/Apachectl start

　　#service httpd start

　　fi

　　#3.ftp

　　ftp=`netstat -an | grep LISTEN | grep :21`

　　if [ “$ftp“ != ““ ]; then

　　echo $ftp

　　echo “FTP is runing “

　　else

　　echo “FTP is not runing“

　　killall -9 vsftpd

　　#service vsftpd start

　　/etc/init.d/vsftpd start

　　fi

　　#4.ssh

　　ssh=`netstat -ntlp | awk '{print $4}' | grep :22$`

　　#ssh=`netstat -an | grep LISTEN | grep :22`

　　if [ “$ssh“ != ““ ]; then

　　echo $ssh

　　echo “SSH is running“

　　else

　　echo “SSH is not running“

　　fi

　　#5.sendmail pop3

　　smtp=`netstat -an | grep LISTEN | grep :25`

　　pop3=`netstat -an | grep LISTEN | grep :110`

　　if [ “$smtp“ != ““ ] && [ “$pop3“ != ““ ]; then

　　echo “Send mail is OK!“

　　elif [ “$smtp“ != ““ ] && [ “$pop3“ = ““ ]; then

　　echo “ Send mail have some problems of your pop3!“

　　elif [ “$smtp“ = ““ ] && [ “$pop3“ != ““ ]; then

　　echo “Send mail have so me problems of your smtp!“

　　else

　　echo “Send mail is NO Trunning!“

　　fi