コマンドls Unixプログラミングp5

myls.c

#include "include/apue.h"
#include <dirent.h>

int
main(int argc, char *argv[])
{
        DIR             *dp;
        struct dirent          *dirp;

        if (argc != 2)
                err_quit("usage: ls directory_name");

        if ((dp = opendir(argv[1])) == NULL)
                err_sys("can't open %s", argv[1]);
        while ((dirp = readdir(dp)) != NULL)
                printf("%s\n", dirp->d_name);

        closedir(dp);
        exit(0);
}