Using command-line arguments

Command-line arguments allow your programs to get input, such as the names of the files you want to process, without having to write a different version of the program. Hence, you cannot create any useful systems software if you're unable to process the command-line arguments passed to it.

So here is a naive Go program, named cla.go, that prints all its command-line arguments, including the name of the executable file:

package main 
 
import "fmt" 
import "os" 
 
func main() { 
   arguments := os.Args 
   for i := 0; i < len(arguments); i++ { 
         fmt.Println(arguments[i]) 
   } 
} 

As you can see, Go needs an extra package named os in order to read the command-line arguments of a program that are stored in the os.Args array. In case you do not like having multiple import statements, you can rewrite the two import statements as follows, which I find much easier to read:

import ( 
   "fmt" 
   "os" 
)

Note

The gofmt utility puts package names in alphabetical...