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

int main(int argc, char **argv) {
    char c, *filename;
    int lines = 0, fdin = 0, fdout = 1, i = 0, n = 10;
    
    for (i = 1; i < argc; i++) {
	if (argc - 1 <= i + 1) {
	    continue;
	} 
	
	if (strcmp(argv[i], "-n") == 0) {
	    n = atoi(argv[i + 1]);
	}
	
	if (strcmp(argv[i], "-f") == 0) {
	    filename = (argv[i + 1]);
	    fdin = open(filename, O_RDONLY);
	    if (fdin < 0) {
		printf("error: %s non found.\n", filename);
		exit(EXIT_FAILURE);
	    }
	}
    }
    
    while(read(fdin, &c, 1) > 0) {
	if (lines < n) {
	    write(fdout, &c, 1);
	}
	if (c == '\n') {
	    lines++;
	}
    }     

}