#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>

#define BLKSIZE 4096
int main(int argc, char *argv [ ])
{
    int fd, i, m, n;
    char buf[BLKSIZE],dummy;
    fd = 0;
    if(argc > 1){
        fd = open(argv[1],O_RDONLY);
        if(fd < 0) exit(1);
    }
    while(n = read(fd,buf,BLKSIZE)){
        m = write(1,buf,n);
    }
}