ls命令的简单实现源码

#include <dirent.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
DIR *dp;
struct dirent *dirp;
char *curdir = "./";
if(argc != 2)
printf("usage: ls directory_name");
if((dp = opendir(argc == 2 ? argv[1]:curdir)) == NULL) {
printf("can't open %s", argv[1]);
return -1;
}
while((dirp = readdir(dp)) != NULL)
printf("%s\n", dirp->d_name);
closedir(dp);
return 0;
}