Child processes

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

  1. use std::process::Command;
  3. fn main() {
  4.     let output = Command::new("rustc")
  5.         .arg("--version")
  6.         .output().unwrap_or_else(|e| {
  7.             panic!("failed to execute process: {}", e)
  8.     });
  10.     if output.status.success() {
  11.         let s = String::from_utf8_lossy(&output.stdout);
  13.         print!("rustc succeeded and stdout was:\n{}", s);
  14.     } else {
  15.         let s = String::from_utf8_lossy(&output.stderr);
  17.         print!("rustc failed and stderr was:\n{}", s);
  18.     }
  19. }

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