FS Functions

File system functions ใน Rust

Basic File Operations

use std::fs;

fn main() -> std::io::Result<()> {
    // ============================================
    // Read entire file
    // ============================================

    let contents = fs::read_to_string("/etc/hostname")?;
    println!("Hostname: {}", contents.trim());

    // ============================================
    // Read as bytes
    // ============================================

    let bytes = fs::read("/etc/hostname")?;
    println!("Bytes: {:?}", &bytes[..5.min(bytes.len())]);

    // ============================================
    // Write string
    // ============================================

    fs::write("/tmp/test.txt", "Hello, World!")?;

    // ============================================
    // Write bytes
    // ============================================

    fs::write("/tmp/binary.dat", &[0u8, 1, 2, 3, 4])?;

    // Verify
    println!("Written: {}", fs::read_to_string("/tmp/test.txt")?);

    Ok(())
}