文件读写相关函数

https://www.cnblogs.com/starrys/p/12008562.html
https://blog.csdn.net/Edward_Asia/article/details/124494079

文件打开与关闭

https://blog.csdn.net/weixin_68278653/article/details/130836626

读写

一、二进制文件

• fread
  https://blog.csdn.net/sun13212715744/article/details/134010502

二、文本文件

• fgets
  https://blog.csdn.net/Devour_/article/details/110955333
  https://www.cnblogs.com/L-0x0b/p/10858518.html

回车与换行符：https://blog.csdn.net/wangsh217/article/details/11031089/

目录操作

https://blog.csdn.net/qq_64928278/article/details/131945858

其它

• 创建目录
  https://blog.csdn.net/m0_50695101/article/details/131112354

#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdio.h>
//创建目录名（先判断存不存在）
int file_exist(const char* path){
    DIR *dp;
    if ((dp = opendir(path)) == NULL){
        mkdir(path, S_IRWXU);
        //printf("path = %s\n", path);
        return 0;
    }
    else{
        closedir(dp);
        return 1;
    }
}

int main(int argc, char* argv[]){
    file_exist(argv[1]);
    return 0;
}

• 改变工作目录(chdir)
  https://blog.csdn.net/leimeili/article/details/133339927

• 目录遍历
  https://blog.csdn.net/fuhanghang/article/details/132446193

• 删除目录rmdir

fd操作

• 获取目录的fd值 （dirfd）
  https://www.cnblogs.com/hulubaby/p/9382583.html

• 通过fd获取目录（fchdir）
  https://www.jb51.net/article/71811.htm