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Showing posts with label Hole in a file. Show all posts
Showing posts with label Hole in a file. Show all posts
Tuesday, August 12, 2014
/*C program to create a file with 16 bytes of arbitrary data from the beginning and another 16 bytes of arbitrary data from an offset of 48.Display the following file contents to demonstrate how the hole in a file is handled */
#include<stdio.h>
#include<fcntl.h>
#include"string.h"
int main()
{
//create a new file by named as file.txt
int n=creat("file.txt","w");
char ch[16]="hello world how are";
char str[20]="od -c file.txt";
//change permission of file.txt with maximum access
system("chmod 777 file.txt");
//write "helloworld string in file.txt
write(n,ch,16);
// to move cursor from begging to 48th position
lseek(n,48,SEEK_SET);
//write "helloworld string in file.txt
write(n,ch,16);
// to prompt command in command prompt
system(str);
return(0);
}
/*C program to create a file with 16 bytes of arbitrary data from the beginning and another 16 bytes of arbitrary data from an offset of 48.Display the following file contents to demonstrate how the hole in a file is handled with using Command Line Arguments*/
#include<stdio.h>
#include<fcntl.h>
#include"string.h"
int main(int argc,char *argv[])
{
int n=creat(argv[1],"w");
char ch[16]="hello world how are";
char str[20]="od -c ";
char mode[20]="chmod 777 ";
write(n,ch,16);
lseek(n,48,SEEK_SET);
write(n,ch,16);
strcat(mode,argv[1]);
system(mode);
strcat(str,argv[1]);
system(str);
return(0);
}
--------------------------------
screenshot:
#include<stdio.h>
#include<fcntl.h>
#include"string.h"
int main(int argc,char *argv[])
{
int n=creat(argv[1],"w");
char ch[16]="hello world how are";
char str[20]="od -c ";
char mode[20]="chmod 777 ";
write(n,ch,16);
lseek(n,48,SEEK_SET);
write(n,ch,16);
strcat(mode,argv[1]);
system(mode);
strcat(str,argv[1]);
system(str);
return(0);
}
--------------------------------
screenshot:
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