Step by Step solution about How to resolve the algorithm Execute a system command step by step in the Go programming language

This Go program executes the ls -l command in a child process and prints the output to the standard output and standard error. Here's a detailed explanation:

1. package main: This line indicates that the code is part of the main package, which is the entry point for Go programs.

2. import ( ... ): This block imports the necessary standard library packages:

   • log: Used for logging errors.
   • os: Used for interacting with the operating system.
   • os/exec: Used for executing external commands.

3. func main(): This is the main function, which is the entry point for the program.

4. cmd := exec.Command("ls", "-l"): This line creates a new Command object representing the ls -l command. The ls command lists files and directories in the current working directory, and the -l flag displays the output in a long format.

5. cmd.Stdout = os.Stdout: This line sets the standard output of the command to be the standard output of the program. This means that the output of the ls command will be written to the console where the program is running.

6. cmd.Stderr = os.Stderr: Similarly, this line sets the standard error of the command to be the standard error of the program. Any error messages from the ls command will be written to the console.

7. if err := cmd.Run(); err != nil: This line executes the ls command and checks for any errors. The Run method starts the command and waits for it to finish. If there is an error, it will be stored in the err variable.

8. log.Fatal(err): If an error occurred while executing the command, this line will log the error to the console and exit the program. The log.Fatal function is used for fatal errors that should terminate the program.

In summary, this program uses the os/exec package to execute the ls -l command as a child process and prints the output to the console. It also handles any errors that may occur during the command execution.

package main

import (
    "log"
    "os"
    "os/exec"
)

func main() {
    cmd := exec.Command("ls", "-l")
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    if err := cmd.Run(); err != nil {
        log.Fatal(err)
    }
}