フォルダー構造

$ tree -L 2
.
├── Cargo.lock
├── Cargo.toml
├── src
│   └── main.rs
└── target
    └── debug

Cargo.toml

[package]
name = "redis_delete"
version = "0.1.0"
edition = "2018"

#

[dependencies.redis]
version = "*"

[dependencies]
tokio = { version = "0.2", features = ["full"] }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"

src/main.rs

// --------------------------------------------------------------------
/*
	redis_delete/src/main.rs

					Jul/22/2020
*/
// --------------------------------------------------------------------
use std::env;
extern crate redis;
use redis::{Commands};

// --------------------------------------------------------------------
fn main() -> Result<(), Box<dyn std::error::Error>>  {
	eprintln! ("*** 開始 ***");

	let args: Vec<_> = env::args().collect();
	let key_in = &args[1];
	eprintln! ("{}",key_in);

	let client = redis::Client::open("redis://localhost/").expect("url error");
	let mut conn = client.get_connection().expect("connect error");


//	let key_in = "t1853";

	let result: i32 = conn.del(key_in).unwrap();
	println!("削除結果: 1 => 成功, 0 => 失敗");
	println!("del result for myKey: {}", result);


	eprintln! ("*** 終了 ***");

	Ok(())
}

// --------------------------------------------------------------------

コンパイル

cargo build

実行

cargo run t1856