Rust by Example

Child processes

The process::Output struct represents the output of a finished child process, and the process::Command struct is a process builder.

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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(You are encouraged to try the previous example with an incorrect flag passed to rustc)