//implementation of cat <filename> | wc -l

#include <stdio.h>
#include <string.h>
#define size 500
int main(int argc,char * argv[])
{

   int pipe1[2];
   int childpid;
   FILE * fp;
   char buffer[size];
   int status;
   int lines;
   if(argc!=2)
   {
     printf("usage : mycat <file name>\n");
     exit(1);
   }
   pipe(pipe1);
   childpid=fork();
   if(childpid>0)
   {
      close(pipe1[0]);
      fp=fopen(argv[1],"r");
      if(fp==NULL)
      {
         printf("Cannot open file");
         exit(1);
      }
     while(fgets(buffer,sizeof(buffer),fp)!=NULL)
       write(pipe1[1],buffer,strlen(buffer));

      fclose(fp);
      wait(&status);
      close(pipe1[1]);
      exit(0);
   }
   else
   {
      close(pipe1[1]);
      lines=0;
       while (read(pipe1[0],buffer,sizeof(buffer)) > 0)
           lines++;
      printf("%d",lines);
      close(pipe1[0]);
      exit(0);
   }
}