rust运行shell命令并获取输出
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2021-08-17 17:53:28
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use std::io::{BufReader, BufRead}; use std::process::{self, Command, Stdio};
fn main() { ls(); ps(); xargs(); time(); iostat(); }
fn ls() { let output = Command::new("ls").output().expect("执行异常,提示"); let out = String::from_utf8(output.stdout).unwrap(); println!("{}", out); }
fn ps() { let output = Command::new("ps") .arg("-q") .arg(process::id().to_string()) .arg("-o") .arg("%cpu,%mem") .output() .unwrap(); let out = String::from_utf8(output.stdout).unwrap(); println!("{}", out); }
fn xargs() { let mut cmd = "cat /proc/".to_string(); cmd += &process::id().to_string(); cmd += &"/stat | awk '{print $14,$15,$16,$17}'".to_string(); let output = Command::new("bash") .arg("-c") .arg(cmd) .output() .unwrap(); let out = String::from_utf8(output.stdout).unwrap(); println!("utime stime cutime cstime"); println!("{}", out); }
fn time() { let mut fname = "/proc/".to_string(); fname += &process::id().to_string(); fname += &"/stat".to_string(); let child = Command::new("cat") .arg(fname) .stdout(Stdio::piped()) .spawn() .unwrap(); let output = Command::new("awk") .arg("{print $14,$15,$16,$17}") .stdin(child.stdout.unwrap()) .output() .unwrap(); let out = String::from_utf8(output.stdout).unwrap(); println!("utime stime cutime cstime"); println!("{}", out); }
fn iostat() { let child = Command::new("iostat") .arg("1") .stdout(Stdio::piped()) .spawn() .unwrap(); let mut out = BufReader::new(child.stdout.unwrap()); let mut line = String::new(); while let Ok(_) = out.read_line(&mut line) { println!("{}", line); } }
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参考文献:
rust:执行shell命令
https://stackoverflow.com/questions/40836973/unable-to-use-stdprocesscommand-no-such-file-or-directory
https://www.reddit.com/r/rust/comments/3azfie/how_to_pipe_one_process_into_another/