18.5 Child processes

process::Output 구조체는 종료된 하위 프로세스의 출력을 나타내고, process::Command 구조체는 process 제작자다.

use std::process::Command;
fn main() {
let output = Command::new("rustc")
.arg("--version")
.output().unwrap_or_else(|e| {
panic!("failed to execute process: {}", e)
});
if output.status.success() {
let s = String::from_utf8_lossy(&output.stdout);
print!("rustc succeeded and stdout was:\n{}", s);
} else {
let s = String::from_utf8_lossy(&output.stderr);
print!("rustc failed and stderr was:\n{}", s);
}
}
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(상기 예제에서 rustc에게 틀린 플래그를 전달해보세요.)

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