Run os commands with rust

main.rs

extern crate libc;
use std::process::{Command,Stdio};

fn main() {
    println!("Hello, world!");
    unsafe {
        println!("Euid is {}",libc::geteuid());
    }
    println!("ps output {:?}",Command::new("ps").arg("-efl").output().unwrap());
    let ps_cmd = Command::new("ps").arg("-efl").stdout(Stdio::piped()).spawn().expect("Error ps cmd");
    let ps_out = ps_cmd.stdout.expect("error ps out");
    let grep_cmd = Command::new("grep").arg("docker").stdin(ps_out).stdout(Stdio::piped()).spawn().expect("Error grep cmd");
    let out = grep_cmd.wait_with_output().expect("Error out");
    println!("Final output {:?}",out.stdout.as_slice());
}

Running OS commands with rust

Set UID on executable

• An executable can be set UID bit to make it runner with owner user instead of caller.
• This can be used where you want to execute a higher privileges program(like root) with lower privileges user.
• chmod 4111 <executable>
• libc::geteuid() gives you effective user id after set UID