#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<string.h>
#include<stdlib.h>
char new[20],old[20]; 
int main()
{
    int fd[2];
    pid_t cd;
 
    char rb[50];
    char wb[50];
    int rc;
    printf("enter name of old file and new file");
    gets(old);
    gets(new);
    pipe( fd );
 
    int fo = open( old, 0 );
    int tf = open( new, 0666 );
     
    if ( fo == -1 || tf == -1 ) {
        printf( "Opening file failed " );
        exit(1);
    }
    cd = fork();
 
    if( cd == 0 ) {
        // inside the child prcocess
        close( fd[1] );
 
        read( fd[0], rb, sizeof( rb ) );
        printf( "The recived string is : %s", rb );
 
        //Writing to the target fileOpen
        write( tf, rb, strlen( rb ) + 1 );
    } else {
        // inside the parent process
        close( fd[0] );
        // code to read from a text file
 
        while( (rc = read( fo, rb, sizeof( rb ) ) > 0 ) )  {
        write( fd[1], rb, sizeof( rb ) );
        }
        close( fd[1] );
    }
}