#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>

int comp(const void *a, const void *b) {
	return strcmp((char *)a, (char *)b);
}

int main(void) {
	DIR *dir;
	struct dirent *dp;
	dir = opendir("/bin");

	char list[1024][64];
	int cnt = 0;
	for (dp = readdir(dir); dp != NULL; dp = readdir(dir)) {
		char *t = dp -> d_name;
		if (t[0] != '.') strcpy(list[cnt++], t);
	}
	closedir(dir);

	qsort(list, cnt, sizeof(char) * 64, comp);
	int i;
	for (i = 0; i < cnt; i++) printf("%s\n", list[i]);
	return 0;
}