5

std::process

 2 years ago
source link: https://doc.rust-lang.org/std/process/struct.Command.html
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.
neoserver,ios ssh client

Struct std::process::Command1.0.0[−][src]

pub struct Command { /* fields omitted */ }

A process builder, providing fine-grained control over how a new process should be spawned.

A default configuration can be generated using Command::new(program), where program gives a path to the program to be executed. Additional builder methods allow the configuration to be changed (for example, by adding arguments) prior to spawning:

use std::process::Command;

let output = if cfg!(target_os = "windows") {
    Command::new("cmd")
            .args(["/C", "echo hello"])
            .output()
            .expect("failed to execute process")
} else {
    Command::new("sh")
            .arg("-c")
            .arg("echo hello")
            .output()
            .expect("failed to execute process")
};

let hello = output.stdout;
Run

Command can be reused to spawn multiple processes. The builder methods change the command without needing to immediately spawn the process.

use std::process::Command;

let mut echo_hello = Command::new("sh");
echo_hello.arg("-c")
          .arg("echo hello");
let hello_1 = echo_hello.output().expect("failed to execute process");
let hello_2 = echo_hello.output().expect("failed to execute process");
Run

Similarly, you can call builder methods after spawning a process and then spawn a new process with the modified settings.

use std::process::Command;

let mut list_dir = Command::new("ls");

// Execute `ls` in the current directory of the program.
list_dir.status().expect("process failed to execute");

println!();

// Change `ls` to execute in the root directory.
list_dir.current_dir("/");

// And then execute `ls` again but in the root directory.
list_dir.status().expect("process failed to execute");
Run

report

Recommend

About Joyk


Aggregate valuable and interesting links.
Joyk means Joy of geeK