量化交易之linux篇 - 《UNIX环境高级编程》 - 取命令行参数，然后针对每一个命令行参数打印其文件类型

#include "apue.h"

int main(int argc, char *argv[]) {
    int i;
    struct stat buf;
    char* ptr;

    for (i = 0; i < argc; i++) {
        printf("%s: ", argv[i]);
        if (lstat(argv[i], &buf) < 0) {
            err_ret("lstat error");
            continue;
        }

        if (S_ISREG(buf.st_mode))
            ptr = "regular";
        else if (S_ISDIR(buf.st_mode))
            ptr = "directory";
        else if (S_ISCHR(buf.st_mode))
            ptr = "character special";
        else if (S_ISBLK(buf.st_mode))
            ptr = "symbolic link";
        else if (S_ISSOCK(buf.st_mode))
            ptr = "socket";
        else
            ptr = "** inknown mode **";
        printf("%sn", ptr);
    }

    exit(0);
}