Go: Command-line arguments

Package: os

The os.Args variable holds the command-line arguments, starting with the program name:

func main() {
	if len(os.Args) != 3 {
		fmt.Println("Usage:", os.Args[0], "PATTERN", "FILE")
		return
	}
	pattern := os.Args[1]
	file := os.Args[2]
	// ...
}
$ go build grep.go
$ ./grep
Usage: ./grep PATTERN FILE

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