Master Golang: Command-Line Arguments

Command-line arguments are a common way to parameterize execution of programs. For example, `go run hello.go` uses `run` and `hello.go` arguments to the `go` program.
	package main
	import ( "fmt" "os" )
	func main() {
`os.Args` provides access to raw command-line arguments. Note that the first value in this slice is the path to the program, and `os.Args[1:]` holds the arguments to the program.	argsWithProg := os.Args argsWithoutProg := os.Args[1:]
You can get individual args with normal indexing.	arg := os.Args[3]
	fmt.Println(argsWithProg) fmt.Println(argsWithoutProg) fmt.Println(arg) }

To experiment with command-line arguments it’s best to build a binary with `go build` first.	$ go build command-line-arguments.go $ ./command-line-arguments a b c d [./command-line-arguments a b c d] [a b c d] c
Next we’ll look at more advanced command-line processing with flags.