rustHow to merge files in Rust

Merging files in Rust can be done using the std::fs::File and std::io::copy functions. The following ## Code example shows how to merge two files into a third file:

use std::fs::File;
use std::io::{copy, Write};

fn main() {
    let mut file1 = File::open("file1.txt").expect("Unable to open file1");
    let mut file2 = File::open("file2.txt").expect("Unable to open file2");
    let mut file3 = File::create("file3.txt").expect("Unable to create file3");

    copy(&mut file1, &mut file3).expect("Unable to copy file1");
    copy(&mut file2, &mut file3).expect("Unable to copy file2");
}

This code will create a new file called file3.txt which will contain the contents of both file1.txt and file2.txt.

Explanation of code parts:

1. use std::fs::File: This imports the File type from the std::fs module, which is used to open files.
2. use std::io::{copy, Write}: This imports the copy and Write functions from the std::io module, which are used to copy data from one file to another and write data to a file, respectively.
3. let mut file1 = File::open("file1.txt").expect("Unable to open file1"): This opens the file file1.txt and stores a mutable reference to it in the file1 variable. The expect method is used to handle any errors that may occur while opening the file.
4. let mut file2 = File::open("file2.txt").expect("Unable to open file2"): This opens the file file2.txt and stores a mutable reference to it in the file2 variable. The expect method is used to handle any errors that may occur while opening the file.
5. let mut file3 = File::create("file3.txt").expect("Unable to create file3"): This creates a new file called file3.txt and stores a mutable reference to it in the file3 variable. The expect method is used to handle any errors that may occur while creating the file.
6. copy(&mut file1, &mut file3).expect("Unable to copy file1"): This copies the contents of file1 to file3. The expect method is used to handle any errors that may occur while copying the data.
7. copy(&mut file2, &mut file3).expect("Unable to copy file2"): This copies the contents of file2 to file3. The expect method is used to handle any errors that may occur while copying the data.

Helpful links:

1. std::fs::File
2. std::io::copy

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