为什么 compgen 命令在 Linux 终端中有效，而在 process::Command 中无效?

问题描述

命令 compgen 在 Linux 终端中工作正常，但在使用 Command::new 时会导致恐慌.

The command compgen works fine in the Linux Terminal, but causes a panic when using Command::new.

我的代码:

use std::process::Command;

fn main() {
    let status = Command::new("compgen")
        .status()
        .expect("failed to execute process");
    println!("process exited with: {}", status);
}

错误信息:

    Compiling terminal v0.1.0 (file:///home/user/programmates/RUST/Terminal/terminal)
     Finished dev [unoptimized + debuginfo] target(s) in 0.66 secs
     Running `target/debug/terminal`
thread 'main' panicked at 'failed to execute process: Os { code: 2, kind: NotFound, message: "No such file or directory" }', libcore/result.rs:945:5
note: Run with `RUST_BACKTRACE=1` for a backtrace.

推荐答案

并非所有可用于 shell 的命令都可以使用 process::Command 运行；compgen是一个 bash 内置命令并且在它，因为它不是一个独立的程序 - 它嵌入在 shell 中.

Not all commands available to the shell are runnable with process::Command; compgen is a bash builtin command and doesn't work outside of it, because it is not a standalone program - it is embedded within the shell.

但是，可以通过传递以下 :

It is, however, possible to invoke bash and execute compgen by passing the following option to it:

Command::new("bash").args(&["-c", "compgen"])

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