stat命令的实现-mysate

一、stat(1)

  • stat作用:用来显示文件的详细信息,包括inode, atime, mtime, ctime
  • stat格式:stat [OPTION]…FILE…
  • stat命令格式:
    • -L:显示符号链接
    • -f:显示文件所在的文件系统信息
    • -t:以简洁的方式输出摘要信息
  • stat输出内容:
    • File:显示文件名
    • Size:显示文件大小
    • Blocks:文件使用的数据块总数
    • IO Block:IO块大小
    • regular file:文件类型(常规文件)
    • Device:设备编号
    • Inode:Inode号
    • Links:链接数
    • Access:文件的权限
    • Gid、Uid:文件所有权的Gid和Uid
  • 学习截图


二、man -k ,grep -r的使用


三、伪代码

声明结构体
读入命令行文件路径
调用stat()函数给结构体赋值
逐个打印结构体中的数据

四、产品代码 mystate.c的码云链接

#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
    struct stat sb;
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <pathname>\n", argv[0]);
        exit(EXIT_FAILURE);
    }
    if (stat(argv[1], &sb) == -1) {
        perror("stat");
        exit(EXIT_FAILURE);
    }
    printf("File type:                ");
    switch (sb.st_mode & S_IFMT) {
        case S_IFBLK:   printf("block device\n");
            break;
    case S_IFCHR:   printf("character device\n");
            break;
    case S_IFDIR:   printf("directory\n");
            break;
    case S_IFIFO:   printf("FIFO/pipe\n");
            break;
    case S_IFLNK:   printf("symlink\n");
            break;
    case S_IFREG:   printf("regular file\n");
            break;
    case S_IFSOCK:  printf("socket\n");
            break;
    default:        printf("unknown?\n");
            break;
    }
    printf("I-node number:            %ld\n", (long) sb.st_ino);
    printf("Mode:                     %lo (octal)\n",(unsigned long) sb.st_mode);
    printf("Link count:               %ld\n", (long) sb.st_nlink);
    printf("Ownership:                UID=%ld   GID=%ld\n",(long) sb.st_uid, (long) sb.st_gid);
    printf("Preferred I/O block size: %ld bytes\n",(long) sb.st_blksize);
    printf("File size:                %lld bytes\n",(long long) sb.st_size);
    printf("Blocks allocated:         %lld\n",(long long) sb.st_blocks);
    printf("Last status change:       %s", ctime(&sb.st_ctime));
    printf("Last file access:         %s", ctime(&sb.st_atime));
    printf("Last file modification:   %s", ctime(&sb.st_mtime));
    exit(EXIT_SUCCESS);
}

五、测试代码,mystat 与stat(1)对比

posted @ 2022-10-15 11:22  戴骏  阅读(94)  评论(0编辑  收藏  举报