The following steps will walk you through the implementation:

1. Create a file named sample_child_process.rs and open it in your text editor.
2. Write the code header with the relevant information:

        //-- #########################
        //-- Task: To call a child process
        //-- Author: Vigneshwer.D
        //-- Version: 1.0.0
        //-- Date: 19 March 17
        //-- #########################

3. Call the standard library:

        // Call the standard library
        use std::process::Command;

4. Define the main function and declare the output variable, which is the Command implementation to execute the child process and get std:output:

        // Main execution of the code
        fn main() {
          // Command to be executed
          let output = Command::new("rustc")
          .arg("--version")
          .output().unwrap_or_else(|e| {
          panic!("failed to execute process: {}", e)
          });

5. Print out the string value of s variable based on the output response using if...else statements:

        // printing the output values
        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 will get the following output upon successful execution of the code: