Append to text file

[alanvardy]

To append to a text file in Rust, you can use the fs::OpenOptions::append method. This method takes a path to the file and returns a Result<File, io::Error> object. You can then use the write_all method on the File object to write data to the file.

Example:

use std::fs::OpenOptions;

fn main() {
    let mut file = OpenOptions::new()
        .write(true)
        .append(true)
        .open("my_file.txt")
        .expect("Failed to open file");

    file.write_all(b"This is some data to append to the file")
        .expect("Failed to write to file");
}