Section 11 of 12

DevOps Tools & CLI

Build command-line tools and DevOps applications

Course Progress

Section 11 of 12

92% complete

Tutorials

Command-Line Arguments

Build powerful CLI tools using Go with the flag package and others.

Code Examples

Flag Packagego
package main

import (
    "flag"
    "fmt"
)

func main() {
    namePtr := flag.String("name", "World", "name to greet")
    agePtr := flag.Int("age", 0, "age of person")
    verbosePtr := flag.Bool("verbose", false, "verbose output")
    
    flag.Parse()
    
    fmt.Printf("Hello, %s!\n", *namePtr)
    
    if *verbosePtr {
        fmt.Printf("Age: %d\n", *agePtr)
    }
}
Docker Interactionsgo
package main

import (
    "context"
    "fmt"
    "os/exec"
)

func main() {
    // Run docker command
    cmd := exec.CommandContext(
        context.Background(),
        "docker", "ps", "-a",
    )
    
    output, err := cmd.Output()
    if err != nil {
        fmt.Println("Error:", err)
    }
    fmt.Println(string(output))
}

Exercises

File Backup Tool

Create a CLI tool to backup files with progress reporting

INTERMEDIATE

Starter Code:

package main

import (
    "flag"
    "fmt"
)

func main() {
    // TODO: Create a file backup CLI tool
}

Hands-on Project

System Monitoring Tool

Build a CLI tool to monitor system resources

ADVANCED

Learning Objectives

  • >CLI development
  • >System calls
  • >Real-time monitoring

Project Tips

  • > Start by understanding the requirements
  • > Break the project into smaller tasks
  • > Test your code frequently as you build
  • > Add error handling throughout your code
  • > Consider edge cases and validate inputs
  • > Document your code with comments
Testing in GoHOMEAdvanced Patterns