#include <stdio.h>

int main(int argc, char **argv) { 
  if(argc!=3) { 
    fprintf(stderr,"\n DIFF File1 File2 \n");
    return(-1);
  }
  FILE *fp1 = fopen(argv[1],"r");
  if(fp1 == NULL) { 
    fprintf(stderr,"\n Unable to open file1:%s \n",argv[1]);
    return(-2);
  }
  FILE *fp2 = fopen(argv[2],"r");
  if(fp2 == NULL) { 
    fprintf(stderr,"\n Unable to open file2:%s \n",argv[2]);
    fclose(fp1);
    return(-3);
  }

  int ok1 = fseek(fp1,0L,SEEK_END);
  long size1 = ftell(fp1);


  int ok2 = fseek(fp2,0L,SEEK_END);
  long size2 = ftell(fp2);

  //-- printf("\n size:   %s:%ld    %s:%ld\n",argv[1],size1,argv[2],size2);

  if(size2>size1) { 
    fseek(fp2,size1,SEEK_SET);
    while(!feof(fp2)) { 
      int c=fgetc(fp2);
      if(c!=-1) { 
	fputc(c,stdout);
      }    
    }
  }
  fclose(fp1);
  fclose(fp2);
  return(0);
}