How Can I Access and Process Command-Line Arguments in Go?

Accessing Command-Line Arguments in a Go Program

Go offers multiple ways to access command-line arguments passed to your program at runtime, allowing you to interact with user input or provide arguments during execution.

One common approach is to use the os.Args variable. It contains a slice of strings representing the arguments passed to the program. The first element of this slice is the program's name, while subsequent elements hold the arguments. For instance, the following code would print the number of arguments and their values:

package main

import (
    "fmt"
    "os"
)

func main() {
    fmt.Println(len(os.Args), os.Args)
}

For more complex command-line argument parsing, you can utilize the flag package. It provides a convenient interface for defining and handling command-line flags, allowing you to specify short and long flags, set defaults, and more. Here's an example using flag:

package main

import (
    "flag"
    "fmt"
)

func main() {
    var verbose bool
    flag.BoolVar(&verbose, "v", false, "Enable verbose output")

    flag.Parse()
    if verbose {
        fmt.Println("Verbose mode enabled")
    }
}

By leveraging these methods, you can seamlessly access and process command-line arguments in your Go programs, empowering you to tailor functionality and enhance user interaction based on user inputs provided at execution time.

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