How to specify flag descriptions and help messages for each flag in Go?

In Go, you can use the flag package to specify flag descriptions and help messages for each flag. Here's the process:

Import the flag package at the beginning of your Go file:

import "flag"

Define the flag variables that you want to use in your program. For example:

var (
    flag1 string
    flag2 int
)

Initialize the flag variables using the flag package's functions. Use the appropriate function based on the data type of the flag. For example:

func init() {
    flag.StringVar(&flag1, "flagname", "default value", "description of flag1")
    flag.IntVar(&flag2, "flagname2", 123, "description of flag2")
}

In the StringVar and IntVar functions:

The first argument is a pointer to the destination variable.
The second argument is the flag name to be used in the command-line arguments.
The third argument is the default value.
The fourth argument is the description or help message for the flag.

Parse the command line arguments using the flag.Parse() function. Call it in your main function or any other function where you want to process the flags:

func main() {
    flag.Parse()

    // Rest of your code
}

Now, when you run your program with appropriate command-line flags, you can access their values using the flag variables that you defined earlier.

Additionally, Go automatically generates a help message for flags. To display the help message, use the -h or --help flag when running your program.

That's it! You have specified flag descriptions and help messages for each flag in your Go program.