system

Cross-platform crate to easily run shell commands, similar to the C system function.

Usage

system and system_output

For simple use cases where you just need the result of a system command, the system and system_output functions can be used.

system inherits the stdout, stderr, and stdin from the parent process whereas system_output captures stdout and stderr and does not inherit an stdin.

An example of using system,

use system::system;

fn main() {
    // Prints "Hello, world!"
    system("echo Hello, world!").expect("Failed to run command.");
}

An example of using system_output,

use system::system_output;

fn main() {
    let out = system_output("echo Hello, world!").expect("Failed to run command.");
    let stdout = String::from_utf8_lossy(&out.stdout);

    #[cfg(target_os = "windows")]
    assert_eq!(stdout, "Hello, world!\r\n");

    #[cfg(not(target_os = "windows"))]
    assert_eq!(stdout, "Hello, world!\n");
}

std::process::Command::system

For more complex uses cases where the underlying Command has to be modified before running the command, the system::System trait is implemented for Command.

The trait adds the function Command::system to create Commands that execute shell commands.

For example,

use std::process::Command;

use system::System;

fn test() {
    let out = Command::system("echo Hello, world!")
        .output()
        .expect("Failed to run command.");
    let stdout = String::from_utf8_lossy(&out.stdout);

    #[cfg(target_os = "windows")]
    assert_eq!(stdout, "Hello, world!\r\n");

    #[cfg(not(target_os = "windows"))]
    assert_eq!(stdout, "Hello, world!\n");
}