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乱读天书，不求甚解

Rust 10.01 std_fs模块

2023-02-05 10:10:59 31 0 0

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> use std::fs;

https://doc.rust-lang.org/std/fs/index.html

```rust
use std::fs;

fn main() {
    //fs::create_dir("/tmp/lala/121").unwrap();//mkdir
    fs::create_dir_all("/tmp/lala/121").unwrap();//mkdir -p
    let text = fs::read_to_string("./src/main.rs").expect("Read file failed!");//读取文件  
    println!("{}",text);
    fs::write("/tmp/abc.rs",text);
    fs::rename("/tmp/abc.rs", "/tmp/aaa.rs").unwrap();

for the_file in  fs::read_dir("/tmp").unwrap() {
        println!("{:?}",the_file.unwrap().path().to_str().unwrap());
    }
}
```
https://doc.rust-lang.org/std/fs/struct.OpenOptions.html    
https://doc.rust-lang.org/std/io/trait.Write.html    
```
use std::fs::OpenOptions;
use std::io::Write;

fn main() {
    let mut file_hd = OpenOptions::new()
                  .write(true)
                  .create(true)
                  .append(true)
                  .open("/tmp/11111.txt")
                  .unwrap();
    file_hd.write(b"xxxxxxxxx\n").unwrap();

let s = "121\n".to_string();
    file_hd.write(s.as_bytes()).unwrap();
    let s = "qqq".to_string();
    file_hd.write((&s).as_bytes()).unwrap();
}
```

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