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Rust でテキストファイルの作成

Last updated at Posted at 2020-07-09

Ubuntu 24.04 で Rust のインストール

sudo apt install rustc

インストールされたバージョン

$ rustc --version
rustc 1.75.0 (82e1608df 2023-12-21) (built from a source tarball)
text_create.rs
// --------------------------------------------------------------------
/*
	text_create.rs

						Jul/09/2020
*/
// --------------------------------------------------------------------
use std::env;
use std::fs::File;
use std::io::{Write};

fn main() -> std::io::Result<()> {

eprintln!("*** 開始 ***");

let args: Vec<_> = env::args().collect();

let ref fname_out = args[1];

let mut file = File::create(fname_out)?;
file.write_all(String::from("t2381\t名古屋\t71842\t2005-9-12\n").as_bytes())?;
file.write_all(String::from("t2382\t豊橋\t14278\t2005-3-15\n").as_bytes())?;
file.write_all(String::from("t2383\t岡崎\t65291\t1950-10-2\n").as_bytes())?;
file.write_all(String::from("t2384\t一宮\t31864\t1950-6-22\n").as_bytes())?;
file.write_all(String::from("t2385\t蒲郡\t49158\t1950-8-14\n").as_bytes())?;
eprintln!("*** 終了 ***");
Ok(())

}

// --------------------------------------------------------------------
Makefile
text_create: text_create.rs
	rustc text_create.rs
clean:
	rm -f text_create

コンパイル

$ make
rustc text_create.rs

実行

$ ./text_create cities.txt
*** 開始 ***
*** 終了 ***
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