Retrieving Previously Run Command Status Code in Rust
In this article, we will discuss how to retrieve the status code of a previously run command in Rust. This is particularly useful when you want to check if a command executed successfully or not. To achieve this, we will use the std::process::Command struct provided by the Rust standard library. We will also ensure that the project is compatible with different shells.
Checking Command Status Code
To retrieve the status code of a previously run command, we can use the status() method provided by the Command struct. This method returns a Result type, which contains the status code of the command. If the command was not successful, the status code will be non-zero. Here's an example:
use std::process::Command;
fn main() {
let output = Command::new("ls")
.arg("-l")
.output()
.expect("Failed to execute command");
let status_code = output.status.code().expect("Failed to get status code");
println!("Status code: {}", status_code);
}
In this example, we execute the ls -l command and retrieve its status code. The output() method returns a Result type, which contains the output of the command. We then use the status field to retrieve the status of the command and the code() method to get the status code.
Making the Project Compatible with Different Shells
To make the project compatible with different shells, we can use the std::env::var() function to retrieve the name of the shell. We can then use this information to modify the command accordingly. Here's an example:
use std::env;
use std::process::Command;
fn main() {
let shell = env::var("SHELL").expect("Failed to get shell name");
let mut command = match shell.as_str() {
"/bin/bash" | "/bin/sh" => Command::new("bash"),
_ => Command::new("sh"),
};
command.arg("-c")
.arg("ls -l")
.output()
.expect("Failed to execute command");
let status_code = command.status.code().expect("Failed to get status code");
println!("Status code: {}", status_code);
}
In this example, we retrieve the name of the shell using the env::var() function. We then use a match statement to determine the name of the shell and set the command accordingly. If the shell is /bin/bash or /bin/sh, we set the command to bash. Otherwise, we set the command to sh. We then execute the command and retrieve its status code.
- To retrieve the status code of a previously run command in Rust, use the
status()method provided by theCommandstruct. - To make the project compatible with different shells, use the
std::env::var()function to retrieve the name of the shell and modify the command accordingly.