ls -al|grep -i sam.

void exec(int argc,char *in[]){
int pipefd[2];
char *argv[20];
pid_t pid,pid2,child,child2;
int j,status,i;
i=0;

/* Creation of pipes for communication */
if(pipe(pipefd) < 0){
   perror("Pipe failure \n");
   exit(-1);
   }
  
        
         if((pid = fork())<0){
         perror("Fork Failure \n");
         exit(-1);
         }
         
         else if(pid == 0){
         printf("In Child1 process args are %s \n",in[i]);          
                    
             printf(" In child1 process args are *%s* * %s \n",argv[0],argv[1]); 
            close(pipefd[0]);//close the read end
            
            if(dup2(pipefd[1],1) < 0){//duplicate write end with stdout
          perror("duplication failed \n");
          exit(-1);    
            }
            
            parse(in[i],argv);
            if((execvp(argv[0],argv)) < 0)
            {perror(" execvp error \n");
            exit(1);
            }
                  //close(pipefd[1]); 
                  child = waitpid(pid,&status,0);
            }
            
            if((pid2 = fork()) < 0){
			  perror(" Fork failed 1 : ");
			  exit(-1);
		  }
		     
		     else if(pid2 == 0){
				 
				         
          close(pipefd[1]);//close the write end of the pipe
          
          if(dup2(pipefd[0],0) < 0){  //duplicate read end with stdin
          perror("duplication failed \n");
          exit(-1);
          }     
          
          //printf(" %s  %s \n",argv1[0],argv1[1]); 
          
          parse(in[i+1],argv); // parse the input to create arg array
          printf("In child2 args are %s * %s %s\n",argv[0],argv[1],argv[2]);
          if((execvp(argv[0],argv)) < 0){
            perror(" execvp child error \n");
            exit(1);
            }
            //close(pipefd[0]);//close after command is completed
           
            }
            else
            {/* the main parent process */
               close(pipefd[0]);
               close(pipefd[1]);
               child2 = waitpid(pid2,&status,0);
		   }
return;
}

Shell$>-rwxr-xr-x 1 ameya ameya   7465 2011-09-09 02:34 sample
-rwxr-xr-x 1 ameya ameya   7135 2011-09-14 23:57 sample2
-rw-r--r-- 1 ameya ameya    246 2011-09-14 23:57 sample2.c
-rwxr-xr-x 1 ameya ameya   7426 2011-09-15 01:49 sample3
-rw-r--r-- 1 ameya ameya   1294 2011-09-15 01:49 sample3.c
-rwxr-xr-x 1 ameya ameya   7284 2011-09-19 14:42 sample4
-rw-r--r-- 1 ameya ameya    333 2011-09-19 14:42 sample4.c
-rwxr-xr-x 1 ameya ameya   7135 2011-09-27 00:51 sample7
-rw-r--r-- 1 ameya ameya    807 2011-09-09 02:33 sample.c

Shell$>Currently in child2 process *grep *-i *sam 
 execvp error 
: No such file or directory