
#include<stdio.h>
#include<stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/time.h>
#include<string.h>
int ()
{
int flag=1;
const char delimiter[]=" \n\t";
FILE *fp1;
char line1[100];
char filename1[50];
char *token;

while(1)
{
system("wget http://www.cs.rmit.edu./students/ ");
system("mv index.html test1");
sleep(3600);
system("wget http://www.cs.rmit.edu./students/ ");
system("mv index.html test2");
system("diff test1 test2 >test3");
system("file test3 >test4"); 
strcpy(filename1,"test4");
if((fp1=fopen(filename1,"r"))==NULL){
printf("cannot open file\n");
exit(1);
}
fgets(line1,sizeof(line1),fp1);
token=strtok(line1,delimiter);
        while(token!=NULL)
                {
if(strcmp(token,"empty")==0)
{
printf(" CHANGES\n");
flag=0;

}
token=strtok(NULL,delimiter);

                 }
if(flag==1)
{
system("mail  < test3");
}
fclose(fp1);
}
return(0);
}








#include <stdio.h>	
#include <sys/time.h>

#include <strings.h>
#include <stdlib.h>
#include <ctype.h>



int () 
	{
	 FILE *fileopen;
  
	char *t_tst,chk[6]; 
    
	system("wget -p --convert-links http://www.cs.rmit.edu./students/");
	
  
	system("mkdir original");

  
	system("mv www.cs.rmit.edu./images/*.*  original/");

	system("mv www.cs.rmit.edu./students/*.* original/");
	

	sleep(75);

	system("wget -p --convert-links http://www.cs.rmit.edu./students/");
  
	system("mkdir two");
  
	system("mv www.cs.rmit.edu./images/*.* fresh/");

	system("mv www.cs.rmit.edu./students/*.* fresh/");
  
	system("diff one two > image_dif.txt");
  
	fileopen = fopen("imagedif.txt","r");
	t_tst = fgets(chk, 6, fileopen);
  
	if (strlen(chk) != 0)
     
	  system("mailx -s  \" WatchDog program has observed some Differences \" @.rmit.edu. < image_dif.txt");
	
		return 0;
	
}











