Rust Child Processes | Process Output | Command Execution

Introduction

In this lab, we learn about child processes in Rust using the process::Output struct to represent the output of a finished child process and the process::Command struct to build processes. The example code demonstrates how to execute the rustc --version command and handle the output accordingly by checking if the process succeeded or failed.

Note: If the lab does not specify a file name, you can use any file name you want. For example, you can use main.rs, compile and run it with rustc main.rs && ./main.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL rust(("`Rust`")) -.-> rust/BasicConceptsGroup(["`Basic Concepts`"]) rust(("`Rust`")) -.-> rust/DataTypesGroup(["`Data Types`"]) rust(("`Rust`")) -.-> rust/FunctionsandClosuresGroup(["`Functions and Closures`"]) rust(("`Rust`")) -.-> rust/DataStructuresandEnumsGroup(["`Data Structures and Enums`"]) rust(("`Rust`")) -.-> rust/ErrorHandlingandDebuggingGroup(["`Error Handling and Debugging`"]) rust/BasicConceptsGroup -.-> rust/variable_declarations("`Variable Declarations`") rust/DataTypesGroup -.-> rust/string_type("`String Type`") rust/FunctionsandClosuresGroup -.-> rust/function_syntax("`Function Syntax`") rust/FunctionsandClosuresGroup -.-> rust/expressions_statements("`Expressions and Statements`") rust/DataStructuresandEnumsGroup -.-> rust/method_syntax("`Method Syntax`") rust/ErrorHandlingandDebuggingGroup -.-> rust/panic_usage("`panic! Usage`") subgraph Lab Skills rust/variable_declarations -.-> lab-99273{{"`Executing Child Processes in Rust`"}} rust/string_type -.-> lab-99273{{"`Executing Child Processes in Rust`"}} rust/function_syntax -.-> lab-99273{{"`Executing Child Processes in Rust`"}} rust/expressions_statements -.-> lab-99273{{"`Executing Child Processes in Rust`"}} rust/method_syntax -.-> lab-99273{{"`Executing Child Processes in Rust`"}} rust/panic_usage -.-> lab-99273{{"`Executing Child Processes in Rust`"}} end

Child processes

The process::Output struct represents the output of a finished child process, and the process::Command struct is a process builder.

use std::process::Command; fn main() { let output = Command::new("rustc") .arg("--version") .output().unwrap_or_else(|e| { panic!("failed to execute process: {}", e) }); if output.status.success() { let s = String::from_utf8_lossy(&output.stdout); print!("rustc succeeded and stdout was:\n{}", s); } else { let s = String::from_utf8_lossy(&output.stderr); print!("rustc failed and stderr was:\n{}", s); } }

(You are encouraged to try the previous example with an incorrect flag passed to rustc)

Executing Child Processes in Rust

Introduction

Skills Graph

Child processes

Summary

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