stat命令实现

stat命令实现

1.要求

学习使用stat(1),并用C语言实现

• 提交学习stat（1）的截图
• man -k ,grep -r的使用
• 伪代码
• 产品代码 mystate.c，提交码云链接
• 测试代码，mystat 与stat（1）对比，提交截图

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2.stat（1）学习

3.man -k与grep -r使用

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4.伪代码
调用函数stat()
打印输出节点ino、
文件类型mode、
文件的连接数nlink、
用户ID uid和组ID gid、
块大小blksize、
字节数size、
块数目blocks、
三个时间atime、mtime和ctime

5.产品代码

#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>
", 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
");
            break;
    case S_IFCHR:   printf("character device
");
            break;
    case S_IFDIR:   printf("directory
");
            break;
    case S_IFIFO:   printf("FIFO/pipe
");
            break;
    case S_IFLNK:   printf("symlink
");
            break;
    case S_IFREG:   printf("regular file
");
            break;
    case S_IFSOCK:  printf("socket
");
            break;
    default:        printf("unknown?
");
            break;
    }
    printf("I-node number:            %ld
", (long) sb.st_ino);
    printf("Mode:                     %lo (octal)
",(unsigned long) sb.st_mode);
    printf("Link count:               %ld
", (long) sb.st_nlink);
    printf("Ownership:                UID=%ld   GID=%ld
",(long) sb.st_uid, (long) sb.st_gid);
    printf("Preferred I/O block size: %ld bytes
",(long) sb.st_blksize);
    printf("File size:                %lld bytes
",(long long) sb.st_size);
    printf("Blocks allocated:         %lld
",(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);
}

代码链接https://gitee.com/tang_zi_yue1927/code/commit/eebafd9a0183e326a466911e0933ab51b28b1676

6.对比截图